My cat has 2 bowls of fresh water kept clean and changed every day.
I caught him licking the moisture from a sink after I washed my hands in it...
My strategy is to just add a measure of water to his wet food twice a day, which ends up being more water than he'd drink throughout the day on his own.
I'm hoping it'll help him avoid some issues as he grows old.
Heat exchangers have >100% efficiency.
We just need to use those to move the extra heat outside the environment.