I'm sorry to hear about Skinny and I agree that the RX diets aren't very healthy ones. My Storm had crystals and he became blocked twice so he had to have the PU surgery. He was a few different RX Urinary diets for a while but he would still sometimes get UTI's.

When my RB Starr was diagnosed with Colitis and IBD, my vet put him on a grain free diet. She also said that it would fine for Storm as long as he had plenty of canned food too. Ever since Storm's been on a grain free diet, he's never had any more urinary tract problems. At first I had everyone on Innova Evo, then I tried TOTW but some of my cats couldn't handle it and they got diarrhea. Then I tried Nature's Variety which was much more expensive and some of my cats got sick. Now the oldest 4 are all on Wellness Core dry and some of the Wellness grain free dry. Storm eats 4 small feedings a day and he eats about 1/2 can per day. It's sp hard to find one food that everyone likes and does well on. Alani & Blaze have to eat a different food because they don't do well on grain free diets. Good luck with Skinny.