Can you make homemade cat food for a cat with lower urinary tract disease?

Hes currently on prescription food.. I dont want him to have UTIs or anything, but I also dont want him to die from poisoned food. The brand hes currently on has not recalled any cat food, but has recently started recalling some dog food. Can I make his food at home, or is there medicine in it thats otherwide unattainable or hard to get? The brand is Royal Canin.