How can I make water safe to drink to avoid traveler's diarrhea?
Boiling is the most reliable method to make water safe to drink. Bring water to a vigorous boil, then allow it to cool; do not add ice. At high altitudes, allow water to boil vigorously for a few minutes or use chemical disinfectants. Chemical disinfection can be achieved with either iodine or chlorine. Iodine usually provides greater disinfection.
From: Traveler's Diarrhea WebMD Medical Reference
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