If he lives in a warm place, he needs to be well hydrated. Because of my panther dying (from heat exhaustion, not kindey failure, as I found out)
I always have a dripper going except at night and when it runs out around noon (found this out on weekends

), but I am home to refill it by 2-3.
It's always good to have a dripper running. Your chameleon isn't always thirsty at the same time everyday, unless misting provides adequate water, which I am not sure it will, because it dries up too quickly where I live.