How can I avoid traveler's diarrhea from tap water?
As a last resort, if no source of safe drinking water is available, tap water that is uncomfortably hot to the touch may be safer than cold tap water. However, many disease-causing organisms can survive the usual temperature reached by the hot water in overseas hotels and boiling or proper disinfection is still advised.
From: Traveler's Diarrhea WebMD Medical Reference
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