I don't know how closely related IBS and IC are to ulcerative colitis (from the little I know, not much), but the dietary restrictions you mentioned above might be similar.

Here is the story of someone with ulcerative colitis. https://againstallgrain.com/2013/07/13/my-health-transformation/

Hopefully, you might get a recipe idea or two that doesn't cause your bladder to flare.