How long is it safe to drink bottled water after opening and taking a drink from it without refrigerating it afterward?
This depends on a few factors -
1) Does your bottled water contain fluoride? Bottled water containing fluoride will kill a good majority of bacteria introduced after the bottling process, including those in your mouth, which is why we include it in water and toothpaste to begin with. Some purists prefer bottled water without fluoride, in which case the water's only defense from bacteria was the UV sterilization that killed any bacteria in the bottling process.
2) Was your bottle capped tight? W10295370A whirlpool water filter If so, any bacteria introduced to the bottle by your mouth will consume the water's dissolved oxygen and then die. Your water will taste stale from the lack of dissolved oxygen but is pretty safe to drink. If uncapped for a period of time, you may have exposed your water to the environment, including airborne bacteria and insect-borne, especially flies and mosquitoes stopping by for a drink or to lay eggs.
3) Was your water left in the sun, like in a hot car? It's undergone UV sterilization just like the bottling plant performed, and will taste warm and gross and stale, but is pretty safe to drink.
It's more difficult than most people think to introduce harmful bacteria into water; most airborne bacteria can't survive the heat of the human body, and shy of squirrels pooping into your opened well or drinking accidentally from a still pond, contamination from e.Coli and the like is hard to accomplish in drinking water. So in answer, if your water has been fluorinated, capped after opening, left in a closed environment like a house or car with low insect access, exposed to sunlight for several hours, or some combination of the above, your water won't taste great from the lack of dissolved oxygen, but it's good to drink.
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