Irritable Bowel Syndrome

I know this is a long shot given the enshittification of everything these days, but I'd really love to avoid another subscription just to buy groceries. I also don't know if this is even going to be a long diet, IBS is just close enough to the symptoms I have that my PCP wants me to try the diet to see if it helps. I don't have lots of time or space to be cooking every meal either, so I need to be able to grab quick eats from the grocery store, so I figured I'd see if there's any good apps out there that can help me identify which of my normal groceries I should start replacing. TIA!