I hot glue on 16oz. deli cup to the bottom of the tub, then insert another one into it. Cups are easily replaceable whenever the need arises. Alot of times I just clean it and replace it. You have to use a copious amount of glue for bigger snakes so they don't knock it loose. It works well for me. I use aspen bedding as newspaper won't really work with the water bowls like that. I got that tipe from Greg Graziani and I like it so far.

I use the smaller deli cups for babies. I think 8oz. is the size. I order the two sizes that ARS caging has available.