I've got the reptile stone water dishes and didn't like them at all. They are harder to clean than they need to be.
The suggestion of stoneware bowls that are low with a wide base is great, as are your standard dogs dish type bowls but, if you are using a tub and rack system I'd consider deli cups and a piece of PVC or ABS pipe just slightly large ID than the OD of the deli cup.
This is SUCH a great Idea...thanks!!
CRYSTAL MEPH
1.0 100% Het for Carmel Normal–Mycroft (P. regius)
1.2 Manx, Scottish Fold, Tabby–Mocha, Precious, Kitty-Beau (F. domesticus)
30.90 Breeder Mice (M. musculus)
"It will all be okay in the end. If it's not okay, its not the end"
–John Lennon//oo\\