In Reply to: Simple logic posted by Petal on Wednesday, 21. March 2007 at 09:16 Bali Time:
How much of the bottle do you put into your mouth when you drink? I'm not sure about you, but my lips just pretty much touch the top of the opening - where the lid has been sitting. Liquid doesn't leak out - it won't be leaking in.
If, for some reason, you suck the whole neck of the bottle into your mouth, then maybe there could be issues, but I doubt most people drink from a bottle that way.
I should add that, over 4 trips, I've always drank from bottles that came from eskies and ice boxes and I've never once been sick. Same with family members.