My Storm had to have the PU surgery because he kept on becoming blocked. At first they thought that they found stones but later on it was inconclusive. After the surgery he became very stressed due to another cat which I've had to rehome and this caused him to get another UTI. This time his ph was also elevated and they thought they saw some crystals too.

I feed him Royal Canin S/O dry and he was also on the wet but started refusing to eat it so he's now on the Innova Lite wet food. I mix the dry with the wet and I add some water to it to give it more moisture. I researched the Innova food before I started feeding it to him and it says that Lite formula wet food is good for cats prone to urinary tract infections. I used to feed all of my cats the Royal Canin S/O and it won't hurt them but I wanted to be able to feed them a more healthy food. I really don't think that you can prevent this disease from occurring because some cats will get it no matter what you do. Storm also had a very small urethra opening so the surgeon said it was just a matter of time before he had problems. At least you're very well informed about this disease so hopefully your cat won't ever have any problems. Good luck.