Hiya, I have found this site very useful and make up my own snail mix for them - as for bathing, i turn the tap on for a slow tepid flow and put them close enough that they move their heads under the water - it's a good way of checking their shells and underfoot to make sure that all is ok - mine love it!
Super Snails - Snail mixes
Warrensark Stud (rats) Southsea
1.0.0. Cockatiel: Nelson Dilbert, 1.0.0 Blue tongue skink: Worcester, 0.0.2. GALS, ,10.20.0. Rats
1.2.0 Corn snakes: Marmite, Bovrilina & Oxo
0.1.0 Hog Island Boa: Bisto, 0.0.1 Bosc monitor: Colman and 1.0.0 husband