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How risky is drinking stale water?

Asked by longgone (19535points) May 13th, 2015

A friend of mine took a sip from a glass water bottle today. The bottle had previously been opened, then left outside for a few months.

This led to a discussion on the risks of drinking stale water. Do you have any info, any helpful links?

Bonus question: Does it make a difference if the bottle has been in contact with a human’s lips before?

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