When I leave work at night there is usually water left in my water bottle. We have a nice water filter, UV and all that crap, so the water’s clean. When I come in in the morning, a lot of times I’ll just put some ice in what’s left over from yesterday (the ice machine is a lot closer than the water cooler) and drink it.
I never thought there could possibly be anything dangerous about this, but after the pizza thread I thought I’d ask. Should I dump the water and wash out the bottle?
As long as you’re the only person drinking from your water bottle, there is no reason for you to rinse the bottle every night. It’s sort of like using soap and water to wash a pot that was used to boil water.
What can sit still for a few days and be fine. It will, eventually, start feeling “thick” and getting "strings’ at the bottom. This is, of course, due to bacterial growth and you should throw it out.
One of my co-workers does what the OP does. We get Ozarka bottles brought in for the office water cooler, and her theory is, “It’s paid-for water. I shouldn’t throw it out!” Hasn’t killed her yet.
I don’t have any squick factor about doing such a thing, but it makes my throat feel a little burny-scratchy. So I wash my water mug every morning at the office.
Could the OP please come back and reassure me that this thread was a giant whoosh? It seems to be getting a worrying number of serious replies. Unrefrigerated water?
I think water that’s left out too long tastes bad, so I usually pour it out and refill it (from the tap) every morning, or at least drop ice cubes in it. I’ll reuse the glass for 3-4 days, though.
If the water started out clean, there are no (or virtually no) nutrients in it for bacteria to live on. If the bottle is sealed, there should be no bacterial growth. Unless you introduce nutrients to the bottle, it should be OK indefinitely.
I don’t think we’re talking about taking out a clean glass, filling it with water, and leaving it overnight. I think we’re talking about a container that you’ve already drunk some of the water out of, which means it’s got some bits of backwash, skin cells, whatever.