What food do you currently have them on?
I've done some various foods for my two. One of mine, Dex/Fattie (who isn't fat, he's just a proportionately large cat) has had a partial urinary blockage in the past and it seems to be something we've gotten past. I wanted to put them on raw but they seem very adverse to raw.
Currently they get mostly high quality dry but I switch it up. Sometimes i add warm water, sometimes they get wet food mixed in, sometimes they get hairball remedy ontop (well, one does because he gets seasonal hairballs). I always buy different flavors and there are a few brands I use because they don't have any aversion to brand switches. Some days they get wet food only.
Heres an obligatory picture Fatthing and Ollie
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