Originally Posted by columbine
My vet recommended wet food for my Smudge when he had crystals, just because it's got lots of water in it. She also said he might drink more if I put water bowls in more places around the house - it's true, he likes his little "hidden springs" tucked away in his favorite corners! You might also consider getting him a drinking fountain. A cat who drinks lots of water washes out the minerals before they get to form crystals, no matter what kind of crystals they were!
He still likes his kibble (Hill's C/D) best, but he gets a little bit of "treat food" twice a day so I can put his medicine in it. (His crystals were struvite, so I use a low-magnesium food to mix his allergy stuff and vitamins into.) Southern Agriculture and Pet Food Direct carry a lot of specialty foods - they're worth checking.