Food that helps skinny cat gain weight but is also safe for urinary tract?

I have a HUGE problem, my cat was already taken to the vet and his bloodwork is fine but the vet hasn't helped at all for what we need to do next. My cat is only skin and bones, I can't find any meat on him to grab. He use to have bloody stools until we switched the flavor of his cat food. Now he has no... show more I have a HUGE problem, my cat was already taken to the vet and his bloodwork is fine but the vet hasn't helped at all for what we need to do next. My cat is only skin and bones, I can't find any meat on him to grab. He use to have bloody stools until we switched the flavor of his cat food. Now he has no more blood indicating that he suffers from a food intolerance, the problem is he has been in the hospital for urinary problems twice for stones. I can't find food that's safe for both his food issues AND his urinary issues. No one has been able to help so far, not even the vet tech I speak to once a week on the matter... so maybe there's someone out here somewhere that has had a similar problem or knows what to do??
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