If I drank from a water bottle during a meat meal, does it become meat? Basically, if I drink from the same water bottle a few hours later, do I need to wait six hours again?
If you got meat oil on the bottle it could become "a fleishig bottle", or b'cheskas fleishig, under some circumstances. Though eating something pareve from a meat dish never requires you to wait 6 hours. so if you later drank water from it, you would not have to wait. the only issue would be whether or not you could put milk in it and drink from it. Even cooking something pareve in a meat pan, won't necessarily render it fleishig, rather whats called in halachah "b'cheskas fleishig". Which basically means, you can't eat it together with milk, but you don't have to wait after either.