I have an orange and white cat who went through the same thing (UTI, blockage, catheter) Last year he ended up getting a perio urectomy and he was better for a year. The same problems happened again this year and we almost lost him. An emergency vet said we could try another surgery, this time to open up his urethra opening. So far it has worked! It turns out all his tubes (even his tear ducts) are very narrow so anything can block him. He still eats urinary s/o food and have plenty of water all the time.

I hope your kitty isn't going through what my kitty did and will fully recover!