Best water purification tablets for emergencies (2026)
Water purification tablets weigh almost nothing and treat water when you can't boil it. Here are the common options compared on how much water each tablet treats and what chemical it uses.
By PreparedStates editors · Updated October 22, 2026 · 4 products, prices indicative
Our picks
Aquatabs 49mg (100)
Bottle-sized doses for a go-bag
Aquatabs 397mg (100)
Treats stored water in bulk
Potable Aqua + PA Plus
Iodine tablets with a taste fix
All 4 compared
| Tablets | Treats (maker) | Chemical | Pack | Price |
|---|---|---|---|---|
0.75-2 liters per tablet; wait 30 min · Chlorine-based (not iodine) · 100 tablets Bottle-sized doses for a go-bag | 0.75-2 liters per tablet; wait 30 min | Chlorine-based (not iodine) | 100 tablets | |
Our verdictOur verdictResearched One tablet per water bottle, 30 minutes' wait, and no iodine taste. A light backup for every go-bag. Best for Bottle-sized doses for a go-bag Good
Worth knowing
Who shouldn't buy it: Don't buy it if you need to treat large containers: the 397mg tablets do 4 gallons each. | ||||
Up to 4 gallons per tablet · Chlorine-based (not iodine) · 100 tablets Treats stored water in bulk | Up to 4 gallons per tablet | Chlorine-based (not iodine) | 100 tablets | |
Our verdictOur verdictResearched One tablet treats up to 4 gallons: the way to make a container of questionable water drinkable at home. Best for Treats stored water in bulk Good
Worth knowing
Who shouldn't buy it: Don't buy it if you only treat bottles on the go. | ||||
Iodine, with taste neutralizer · 2 x 50 tablets Iodine tablets with a taste fix | — | Iodine, with taste neutralizer | 2 x 50 tablets | |
Our verdictOur verdictResearched Classic iodine tablets plus PA Plus tablets that remove the iodine taste and color afterward. Best for Iodine tablets with a taste fix Good
Worth knowing
Who shouldn't buy it: Don't buy it if you'd rather avoid iodine. | ||||
50 quarts per bottle (listing) · Iodine · 50 tablets The cheapest backup bottle | 50 quarts per bottle (listing) | Iodine | 50 tablets | |
Our verdictOur verdictResearched A small, cheap bottle of iodine tablets for a car or go-bag. Best for The cheapest backup bottle Good
Worth knowing
Who shouldn't buy it: Don't buy it if you want no aftertaste. | ||||
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Before you buy
Match the dose to your container: small tablets treat a bottle, large ones several gallons.
Chlorine-based tablets like Aquatabs leave little taste; iodine tablets can taste stronger, and iodine isn't suitable for everyone, so read the label.
Follow the wait time on the pack (Aquatabs says 30 minutes) before drinking.
If water is cloudy, let it settle or strain it first; the CDC suggests a clean cloth or coffee filter.
We verify every product's specifications against at least two independent sources, re-check its US price and stock on a schedule where we can track it automatically, and cross-check safety-relevant claims against official guidance. Every review is labelled Researched or Used and reviewed by us: where we've bought a product, or been sent it free, and used it ourselves, its review says which; where we haven't, our verdict is a considered spec-and-evidence comparison, not a hands-on test — and commissions never change a ranking either way. Read our full methodology →
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Common questions
Do water purification tablets kill everything?
No. The CDC says chemical disinfectants kill viruses and bacteria but may not kill parasites like Cryptosporidium. Boiling is best.
How long do I wait after adding a tablet?
Follow the pack: Aquatabs says 30 minutes.
Chlorine or iodine tablets?
Chlorine-based tablets have less taste. Iodine works but tastes stronger and isn't suitable for everyone; check the label.
Do purification tablets expire?
Yes, check the date on the pack and replace when it passes.