"Yeah-heh!"
Cal is 100% water, and once he hits the pool he'll be a lot of it too!
The difficult part wasn't turning into water, it'll be getting him back out of the pool. If there's a slight difference in his density, viscosity, evaporasity etcetera with the pool water, we might be able to distil him out of it later... maybe.

Commission price just $32.20 (from $46) with 30% patron discount.
Please support your artists in these difficult times, you don't have to commission me, but you could also become a patron with benefits, here's mine https://www.patreon.com/DonPretzel