I've been in remission for a while, but I suggest SCD Yogurt, that's Specific Carbohydrate Diet.
Basically, those poor bastards are worse on their best days, than I am on my worst. They cut every type of carb out of their diet, and add them back one by one until they find the problem.
Normal yogurt: heat milk to 180 F, hold 30 minutes, cool to below 105, add culture (can be a thing of live culture yogurt, I use Yogurt Starter Formula 2 from Custom Probiotics) and hold at 100 or so for 7 hours. I have an Excallibur food dehydrator, so I use that for yogurt making, basically the square ones that you slide shelves into are great for yogurt, the round ones where you have to stack the shelves don't work to hold the yogurt containers at temp.
SCD yogurt: exactly the same, but hold it at 100 for 24 hours; you digest out all the sugars, and it's probiotic as all hell, pushing kefir levels, way more bugs in a spoonful than storebought. Tart, of course, because you digested out all the sugars.
If I take this, I don't have a flare up. If I have a flare up, this fixes me quickly.
My culture has L. Acidophillos, and L. Bulgaricus (two common strains), S. Thermophilus, L Lactis and B. Lactis.
The SCD folks (who are in bad shape, guts-wise) say eat a cup a day, but DO NOT get a culture with Biffidus for long term use; over 6 months or so it will, um, overcolonize your colon, and cause worse distress than you had before. I think either Dannon or Yoplait uses this one; a thing of commercial yogurt for a starter for a gallon is fine, but if this works for you SWITCH to a different culture that does not have Biffidus before you go with this on a long term basis. I've never tested this, I see no need to reinvent the flat tire. They're pretty emphatic on this point.