I’ve had UC for 29 years now. We have had filtered water for the last 7 years and I can’t say that it’s hurt or helped. I do eat some fiber-you’re “damned if you do and damned if you don’t”.
On the one hand, it helps keep things moving and lowers the risk (supposedly) of developing colon cancer, and on the other hand it can aggravate colitis.
I don’t consume a diet heavy in fiber, but I do eat some, unless the disease is really active.
I use the generic form of Benefiber from Walmart. The ‘Equate’ brand. Two tblspns with two tblspns of apple cider vinegar and a cup of filtered water. I used to take it in the morning but I’ve found it does the most good late in the day after my last meal. By morning it has done its job so I can do mine and usually not think about it for the rest of the day.
I also had to give up one other thing I like, nuts. All kinds of nuts so I now use some creamy peanut butter on flavored rice cakes or a simple PB and honey sandwich when I get that craving. I limit processed sugar foods. I think that’s an irritant as well. Actually I try to limit processed foods in general. It’s hard to do all the time since things like bread, tortillas, and other things do get processed to some extent and of course all canned goods have additives like sodium. I’ve been indulging in quite a bit of watermelon this summer too.
I’m not sure if it makes a difference with the UC but I also started riding a bicycle about a year ago every day for .5 to 1.5 hours. It’s both good exercise and meditative. I have the time since I’m retired. Having stronger leg muscles is a plus. It doesn’t help me lose weight but I think it helps me from gaining it.