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Once you have broken the seal of the water bottle, elements from the air begin to interact with the contents. Increases in the temperature, cause increased reactions.

Answer 2: Dont forget that after you drink from the bottle, good and bad bacteria from your warm mouth has been introduced into the bottle. Heat the water up for coffee or tea, if not toss. Not worth possibly getting sick.

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Q: Why does water in an open plastic bottle taste bad after a day?
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