Wet hides are just a place your snake can go to to get more moisture if it needs to without dunking itself in the water out in the open where it doesn't feel secure.
They're pretty easy to make, just get a cool whip container or a butter container, cut a hole in it and fill it with damp moss or paper towels.
Alot of snakes tend to like to spend alot of time in their wet hides, so it's nothing unusual if your snake seems to like the wet hide alot.
-13mur 6