You can even add more water to the wet food. Keep the fluids going to flush him out, then just the wet food as is once you have the UT problem under control.

Crystals are so not fun - watched a couple of our male cats have that problem back when I was a teenager, before my mom learned to stop giving them the dry food.
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Maureen's furry pack:
MoJo (THE Shiba Imp)
Risa (Chocolate Demon Child..I mean Lab)
Pyewacket (Bengal Cat)
R.I.P. Kitties: Cricket the Tabby and Puff the Russian Blue
www.scottsbt.com/maureen/mo2.htm