Updated Oct 20, 2026 · 2 picks · Prices checked Oct 20, 2026
Tablets are the lightest, cheapest way to make questionable water safe, and they cover the one thing most squeeze filters miss: viruses. Chlorine dioxide products like Katadyn Micropur MP1 kill viruses, bacteria, Giardia and Cryptosporidium, although Crypto can take up to four hours in cold or dirty water. Wirecutter suggests carrying tablets alongside a filter rather than instead of one, because tablets do nothing for silt, chemicals or bad taste. Filter cloudy water first, then treat it. Two-part drops such as Aquamira treat more water per package and cost less per gallon, but take a minute to mix. Either one belongs in a go bag, a car kit and next to your stored water, since they weigh almost nothing and keep for years.
★ Top Pick
Katadyn Micropur MP1 Purification Tablets (30)
Why it's hereChlorine dioxide tablets kill viruses, bacteria, Giardia and Crypto, which the site's filters (LifeStraw, Sawyer) don't fully cover for viruses. Wirecutter recommends tablets alongside a filter.
One tablet per liter; full Crypto kill takes up to 4 hours. Doesn't remove chemicals or dirt; filter first. Sportsman's ($15.95) showed out of stock Oct 18 2026.
