The best water filters and water storage for emergencies
Personal water filters, purification tablets and emergency water storage.
Updated October 6, 2026
Stored water comes first. Ready.gov advises at least one gallon per person per day for several days to cover drinking and sanitation. Containers and bladders on this list hold tap water before an outage. Sealed pouches sit in a kit for years without attention.
A filter or tablet treats water you find later. The CDC says most portable filters remove parasites but not viruses or bacteria. A pore size of 0.3 micron or smaller is needed to also catch bacteria. Most filters here list bacteria and parasites but not viruses.
The shortlist, ranked
How the score works- 1
Press purifier bottle rated for 99.99% virus removal with a 24 oz capacity and 8 second fills.
- Type: press purifier bottle
- Filter life: 350 cycles (65 gal / 250 L) or 3 years
- Removes: 99.99% viruses, 99.9999% bacteria, 99.9% protozoan cysts
- Capacity: 24 oz (710 ml)
Why it is here: Virus removal in a bottle at a rated 99.99%.
- 2
Collapsible 1 L filter flask rated for 1,000 liters with a flow up to 2 L a minute.
- Type: filter bottle (soft flask)
- Filter life: 1,000 L
- Removes: bacteria, cysts, sediment
- Pore size: 0.1 micron
Why it is here: Flow rated up to 2 L a minute by the maker.
- 3
NaDCC chlorine tablets rated at 99.99% viruses that treat water in about 30 minutes.
- Type: NaDCC chlorine tablets
- Removes: viruses (99.99%), bacteria, Giardia cysts
- Tested to: US EPA registered in all 50 states; NSF certified active ingredient
Why it is here: Viruses at a rated 99.99% along with bacteria and Giardia cysts.
- 4
4 L gravity filter for groups rated for 1,500 liters at 1.75 L a minute with no pumping.
- Type: gravity filter
- Filter life: 1,500 L
- Removes: 99.9999% bacteria, 99.9% protozoa
- Capacity: 4.0 L (6.0 L version $154.95)
Why it is here: Pump-free filtering for a group at a rated 1.75 L a minute.
- 5
Squeeze and inline filter with a 0.1 micron absolute membrane and a backflush syringe.
- Type: squeeze / inline filter
- Removes: 99.99999% bacteria, 99.9999% protozoa, 100% microplastics
- Pore size: 0.1 micron
- Weight: 3 oz (85 g)
Why it is here: Absolute 0.1 micron hollow fiber rated for bacteria and protozoa.
- 6
Compact 2 oz filter rated for up to 100,000 gallons that works as a straw and inline too.
- Type: squeeze / straw / inline filter
- Filter life: up to 100,000 gallons (manufacturer rating)
- Removes: 99.99999% bacteria, 99.9999% protozoa, 100% microplastics
- Pore size: 0.1 micron
Why it is here: Rated for up to 100,000 gallons by the maker.
- 7
Squeeze filter at 2.4 oz rated up to 3 L a minute that cleans by shaking or backflushing.
- Type: squeeze filter
- Removes: 99.9999% bacteria, 99.9% protozoa
- Tested to: meets EPA & NSF guidelines (per maker)
- Weight: 2.4 oz (68 g)
Why it is here: Rated flow up to 3 L a minute when squeezed.
- 8
Collapsible 1 L squeeze filter rated for 500 gallons that works as bottle, straw or inline.
- Type: squeeze filter + collapsible bottle
- Filter life: 2,000 L (500 gal)
- Removes: bacteria 99.999999%, parasites 99.999%, microplastics, silt; not viruses or heavy metals
- Capacity: 1 L
Why it is here: Works as a bottle or a squeeze filter and also as a straw or inline.
- 9
Rigid 7 gallon polyethylene container with a spigot stored inside the cap.
- Type: rigid water container
- Capacity: 7 gal (26 L); also 4 gal (15 L)
Why it is here: Spigot stored inside the cap so it stays with the container.
- 10
Gravity purifier rated for 4,755 gallons with virus removal and no power or chemicals.
- Type: gravity purifier
- Filter life: 4,755 gal (18,000 L)
- Removes: 99.999% viruses, 99.999999% bacteria, 99.999% parasites, microplastics; reduces lead
- Weight: 1.17 lb (0.53 kg)
Why it is here: Virus removal at a rated 99.999% puts it in the purifier class on this list.
- 11
Chlorine dioxide tablets with a four-year shelf life that treat a quart in four hours.
- Type: chlorine dioxide tablets
- Removes: bacteria, viruses, cysts incl. Giardia and Cryptosporidium
- Tested to: meets EPA microbiological standards (per maker)
Why it is here: Cryptosporidium and Giardia are both on the maker's list along with viruses and bacteria.
- 12
Foil-packed chlorine dioxide tablets that tester sources credit against viruses and cysts.
- Type: chlorine dioxide tablets
- Removes: viruses, bacteria, cysts (per tester sources)
Why it is here: Tester sources credit the tablets against viruses, bacteria and cysts.
- 13
3 L gravity filter rated for 500 gallons with a filter that doubles as a straw.
- Type: gravity filter
- Filter life: 2,000 L (500 gal)
- Removes: bacteria, parasites, microplastics, silt; not viruses
- Capacity: 3 L
Why it is here: Hands-free filtering for 3 L at a time.
- 14
Bathtub bladder that holds up to 100 gallons of tap water filled before a storm.
- Type: bathtub water bladder
- Capacity: up to 100 gallons
Why it is here: Holds up to 100 gallons depending on the tub.
- 15
Filter bottle with a 22 oz capacity and a two-stage membrane and carbon filter.
- Type: filter bottle
- Filter life: membrane 1,000 gal (4,000 L); carbon 26 gal (100 L)
- Removes: bacteria, parasites, microplastics, sand, dirt, cloudiness
- Capacity: 22 oz
Why it is here: Two-stage filtering with a membrane and activated carbon.
- 16
Straw filter rated for 1,000 gallons that removes bacteria and parasites but not viruses.
- Type: straw filter
- Filter life: 1,000 gal (4,000 L)
- Removes: 99.999999% bacteria, 99.999% parasites, 99.999% microplastics; not viruses
- Pore size: 0.2 micron
Why it is here: Rated for 1,000 gallons of water before the membrane is spent.
- 17
Iodine tablets paired with PA Plus tablets that take the iodine taste away after treatment.
- Type: iodine tablets + taste neutralizer
Why it is here: Treats a quart in 30 minutes before the taste step.
- 18
16.9 oz press purifier rated for 99.99% viruses whose cartridge keeps 10 years unopened.
- Type: press purifier bottle
- Filter life: 300 presses (150 L / 40 gal) or 3 years
- Removes: 99.99% viruses, 99.9999% bacteria, 99.9% protozoan cysts
- Capacity: 16.9 fl oz (500 ml)
Why it is here: Unopened cartridge shelf life of 10 years suits a kit that sits for years.
- 19
Case of 64 single-serve 125 ml water pouches with a five year shelf life.
- Type: emergency water pouches
- Capacity: 64 x 125 ml (8 L)
- Tested to: USCG approval listed
Why it is here: Five year shelf life listed by the maker.
- 20
Thirty 4.2 fl oz water pouches with a 10 year shelf life and a wide temperature range.
- Type: emergency water pouches
- Capacity: 30 x 4.2 fl oz (125 ml)
- Tested to: USCG and US Navy approved (brand page); Kosher
Why it is here: Shelf life of 10 years per the maker.
Head-to-head comparisons
All water filters side by side
Specs from the makers. Scroll sideways on a phone to see every column.
| Model | Score | Type | Filter lifemaker's rating | Removes | Pore size | Capacity | Tested to | Weight |
|---|---|---|---|---|---|---|---|---|
| GRAYL GeoPress 24 oz | 9.4 | press purifier bottle | 350 cycles (65 gal / 250 L) or 3 years | 99.99% viruses, 99.9999% bacteria, 99.9% protozoan cysts | - | 24 oz (710 ml) | - | 15.9 oz (451 g) |
| Katadyn BeFree 1.0L | 9.1 | filter bottle (soft flask) | 1,000 L | bacteria, cysts, sediment | 0.1 micron | 1 L | - | 63 g (2.2 oz) |
| Aquatabs | 9.1 | NaDCC chlorine tablets | - | viruses (99.99%), bacteria, Giardia cysts | - | - | US EPA registered in all 50 states; NSF certified active ingredient | - |
| Platypus GravityWorks 4.0L | 9.1 | gravity filter | 1,500 L | 99.9999% bacteria, 99.9% protozoa | - | 4.0 L (6.0 L version $154.95) | meets EPA & NSF guidelines (per maker) | 11.5 oz (326 g) |
| Sawyer Squeeze | 9.0 | squeeze / inline filter | - | 99.99999% bacteria, 99.9999% protozoa, 100% microplastics | 0.1 micron | - | - | 3 oz (85 g) |
| Sawyer MINI | 8.9 | squeeze / straw / inline filter | up to 100,000 gallons (manufacturer rating) | 99.99999% bacteria, 99.9999% protozoa, 100% microplastics | 0.1 micron | - | - | 2 oz (57 g) |
| Platypus QuickDraw 1L | 8.9 | squeeze filter | - | 99.9999% bacteria, 99.9% protozoa | - | - | meets EPA & NSF guidelines (per maker) | 2.4 oz (68 g) |
| LifeStraw Peak Series Collapsible Squeeze 1L | 8.9 | squeeze filter + collapsible bottle | 2,000 L (500 gal) | bacteria 99.999999%, parasites 99.999%, microplastics, silt; not viruses or heavy metals | - | 1 L | - | 3.2 oz (91 g) |
| Reliance Aqua-Tainer | 8.6 | rigid water container | - | - | - | 7 gal (26 L); also 4 gal (15 L) | - | - |
| LifeStraw Family | 8.6 | gravity purifier | 4,755 gal (18,000 L) | 99.999% viruses, 99.999999% bacteria, 99.999% parasites, microplastics; reduces lead | - | - | - | 1.17 lb (0.53 kg) |
| Potable Aqua Chlorine Dioxide Tablets | 8.6 | chlorine dioxide tablets | - | bacteria, viruses, cysts incl. Giardia and Cryptosporidium | - | - | meets EPA microbiological standards (per maker) | - |
| Katadyn Micropur MP1 | 8.5 | chlorine dioxide tablets | - | viruses, bacteria, cysts (per tester sources) | - | - | - | - |
| LifeStraw Peak Series Gravity 3L | 8.5 | gravity filter | 2,000 L (500 gal) | bacteria, parasites, microplastics, silt; not viruses | - | 3 L | - | - |
| waterBOB | 8.4 | bathtub water bladder | - | - | - | up to 100 gallons | - | - |
| LifeStraw Go Series 22 oz | 8.4 | filter bottle | membrane 1,000 gal (4,000 L); carbon 26 gal (100 L) | bacteria, parasites, microplastics, sand, dirt, cloudiness | - | 22 oz | - | - |
| LifeStraw Personal | 8.3 | straw filter | 1,000 gal (4,000 L) | 99.999999% bacteria, 99.999% parasites, 99.999% microplastics; not viruses | 0.2 micron | - | meets US EPA NSF P231 (bacteria, parasites) | 1.6 oz (45 g) |
| Potable Aqua Tablets with PA Plus | 8.1 | iodine tablets + taste neutralizer | - | - | - | - | - | - |
| GRAYL UltraPress 16.9 oz | 8.0 | press purifier bottle | 300 presses (150 L / 40 gal) or 3 years | 99.99% viruses, 99.9999% bacteria, 99.9% protozoan cysts | - | 16.9 fl oz (500 ml) | - | 12.5 oz (354 g) |
| Datrex Emergency Water | 7.4 | emergency water pouches | - | - | - | 64 x 125 ml (8 L) | USCG approval listed | - |
| SOS Extended Life Emergency Water Pouch | 6.8 | emergency water pouches | - | - | - | 30 x 4.2 fl oz (125 ml) | USCG and US Navy approved (brand page); Kosher | - |
Frequently asked questions
How much water should I store per person per day?
Ready.gov advises at least one gallon per person per day for several days. That covers drinking and sanitation together. A household of four needs four gallons a day on that basis. Rigid containers such as the Reliance Aqua-Tainer hold 7 gallons each. The waterBOB holds up to 100 gallons in a bathtub when filled before an outage. The two pouch cases here hold 8 liters or less.
Does LifeStraw remove viruses?
It depends on the model. The LifeStraw Personal lists bacteria, parasites and microplastics and states that viruses are not removed. The same goes for the LifeStraw Peak Series Collapsible Squeeze 1L and the LifeStraw Peak Series Gravity 3L. The LifeStraw Go Series 22 oz does not name viruses either. The LifeStraw Family is a gravity purifier rated at 99.999% virus removal.
Do water purification tablets kill viruses?
Three of the four tablet products here name viruses. Aquatabs list viruses at 99.99%. Potable Aqua Chlorine Dioxide Tablets list bacteria, viruses and cysts including Giardia and Cryptosporidium. Katadyn Micropur MP1 is credited with viruses, bacteria and cysts by tester sources. Outdoor Life puts Aquatabs at about 30 minutes. Potable Aqua lists four hours per tablet and the Micropur treat time is not in the data.
What is the shelf life of emergency water pouches?
The two pouch products here carry maker figures. Datrex Emergency Water is rated for five years and comes as 64 pouches of 125 ml. The SOS Extended Life Emergency Water Pouch is rated for 10 years. Its storage range runs from minus 22 F to 149 F. Both list a USCG approval. Shelf life is a claim by the maker so check the pack before you rely on it.
Some links on this site are affiliate links. If you buy something after clicking one, the store may pay us a commission. The price stays the same for you, and commissions do not decide which emergency supplies we recommend. Specs come from the makers; range and battery life are their claims. Our method.