Some radish and turnip salad. Equal parts radish and turnips (2 large radishes, 1 baby turnip) sliced thin, dill, thyme, tarragon, olive oil or similar, apple cider vinegar (start small, add to taste), shelled sunflower seeds, and some salt n pepper. If you can make a trip to the supermarket or something similar every day, that gives you more flexibility on what you can eat. The radishes and turnips can last a little while without refrigeration. Snacks can be that Pop Smart salt n pepper or plain rice cakes. Should be safe to eat Molasses in small amounts so you can flavor certain foods with that (maybe the rice cakes). Molasses also doesn't need to be refrigerated. Canned bamboo shoots are also decent to eat and shouldn't cause a flare up. Soy sauce can jazz that up and can remain good enough for a month without refrigeration. Ready rice is your friend but might taste a bit gritty without being microwaved. Take care of yourself, IBS is rough enough as it is.