Bleach: Use only plain, unscented household bleach (sodium hypochlorite). Scented or color-safe bleach should not be used.

Wait time: Let treated water stand for 30 minutes before drinking. If water is cloudy, double the dosage and wait 60 minutes.

Boiling: The most reliable method. Bring water to a rolling boil for 1 minute (3 minutes above 6,500 ft elevation).