For Hermes I just use a little tupperware container...like a sandwich size with enough water that he can submerge himself, but that he can lift his head out of...it may take a little getting used to. But...he may not like it...Cee Cee and Seeley get too freaked out. Hermes likes to swim in little intervals...then he gets out. I usually put the container down on a towel for him and let him in for a swim and let him climb out and explore around a bit...then I put him back in...let him explore a bit, and so on. I do that for about ten minutes every couple of days or so...it's his playtime.