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Originally Posted by DevaMajka 
I totally had no idea that could happen! Do you mind if I ask how you know for sure it was from the water bottle? I drink day old water occasionally- I'm a little bit freaked out now.
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If you've had your mouth on the bottle or container, then organisms from your mouth are left behind in the water. If the bottle is then left in a warm place, or left for a long period of time, those organisms can probably breed and grow. Most of the time, they're harmless organisms, or there's not so many of them, but theoretically I think it's possible to get molds or bacteria in there that might make a person sick.
It's the same reason bottlefeeding mamas are advised to throw away formula after an hour, once baby has had his/her mouth on the bottle-- because the formula is an ideal medium for yuckies to grow in.
It's never happened to me, though.
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