The very fact that we sweat means we have to drink more in hotter climates.
I lived in a hot climate for a long time with no cooling of any kind. I didn't drink much water. I'm not sure if it was good or not, I just didn't like drinking. Sometimes I did sweat a lot, and did what I could eating very juicy fruit and maybe salty nuts if it got to be too much once or twice. I also ate freshly grown sprouts raw frequently. I think you can get water from food. Then again eventually all my organs seemed to start failing. Maybe it was partially due to deficient drinking.
Oops, I'm sorry, this is zero carb. I still don't drink water often. My cats eat raw meat, not much else. They do drink water. We're not cats, so I don't know if we should compare ourselves to them. Maybe us zero carb don't need water. I really think it's individual though, as I see all the zero carbers on this forum doing it different from their fellow zcer ref water, salt etc.