Wet cat food for sensitive stomachs?

Hey all.

I’ve been giving my guy kalkan wet food since I moved here in 2023 with no issues. Earlier this year, it looks like they changed the formula (packaging is also different now) and my cat’s stomach hasn’t seemed 100%. We just adopted a second cat and she is NOT adjusting to this food (I’m talking massive diarrhea that doesn’t always make it in the litter box, it’s lovely). Thinking it’s time for a change for the better and that it’s not just my boy.

Does anyone have recommendations for cat food aimed toward sensitive stomachs that doesn’t cost an arm and a leg? I want to give them the best I can afford, but some of this stuff is ridiculously expensive. The purina wet food is almost double what I’m paying now. Not finding a ton on Google – mostly ads, really expensive stuff, and overseas brands. Just want some opinions from folks who have experience with the stuff.

Thanks!