Well some critters do get their moister needs from the food they eat, maybe his species is one of them ore he just eats really water packed stuff all the time. Dobby has that water bottle and he definitely drinks from it a bit. Nerd got the same styel bottle and a water bowl on top to drink, play, and dunk in. Lurch Only really liked his water bowls and was always making primordial soup out of them from dunking and sitting over them, and would still try to drink from it even when nasty.
Dobby tended to drink from one bowl and dunk in the other but he always sat over one and fouled both of them so we switched to the bottle and it stays clean and he drinks from it just fine like Nerd used to.