This might piss off some of the hydro-homies out there but when talking about water in this context it’s also important to remember that food often contains more hydration than most people give it credit for. Even “dry” foods can end up being like 50% water by weight, and something like soup is obviously very close to 100% water, so people who overcompensate by trying to drink like 8L of straight water a day without considering the rest of their diet can easily get themselves into serious trouble, and water poisoning is actually a real thing that can happen. I think the least controversial take is that for most people, drinking when you’re thirsty is totally sufficient to maintain adequate hydration unless you’re in an extreme situation or you have a personal predisposition towards chronic dehydration. I’m not a big fan of the overgeneralized advice that everyone needs to constantly drink “X” much every day. There isn’t really a one-size-fits-all guideline and the reality varies quite a lot, and in most cases your own body is going to be the most accurate judge of how much water it needs.