My foods that suit my gut generally are not necessarily everyone's choice. But I find the following to cause fewer symptoms:
White Italian Ciabatta bread (always toasted)
Butter
Honey
White rice and sometimes brown as well.
Most kinds of fish, baked in tinfoil with a little salt and water. Canned mackerel, Tuna and Salmon are OK too.
Boiled eggs
Tenderstem broccoli or purple sprouting. I peel the stems!
Asparagus (again I peel the stems)
Green beans
Watercress
Carrots (small ish amounts but can sometimes eat one whole large carrot.)
Pak Choi
Spinach
Rocket
Little gem lettuce but not TOO much of it.
Sugar snap peas
Young Kale leaves
Nettle tops
Courgette (Zucchini)
Small amounts of avocado (maybe 4 or 5 teaspoonfuls.)
Peeled potatoes sometimes.
Very small amounts of chickpeas sometimes.
White pasta sometimes ...but that's a bit boring because I can't have sauces, so I just mix it with my steamed veg.
Peanut butter
Plain cake and lemon drizzle cake.
Occasionally peeled grapes
Chocolate but only brands without "Polyglycerol polyricinoleate (E476) I linked a Wikipedia page about this additive below.)
I cook all my foods very plain, using only salt as a seasoning. Culinary herbs can upset my tummy. I only ever eat my own home cooked foods, and with the exception of some chocolate and cake I have no processed food or only mildly processed (such as pasta)
Low mineral bottled water.
China loose leaf tea
Medium roast ground coffee which I drink black but not strong.
I can drink small or moderate amounts of alcohol without ill effects at all, and in fact a small drink can often soothe my tummy if I feel bad. But I can only drink one kind of alcohol (vodka) as the others upset me.
If I'm having a flare up, I tend to stick to white toast, a little butter, homey, white rice, and only the smallest amounts of vegetables (usually fine green beans and spincah, or nettle tops) until my gut calms down
The Wikipedia link:
https://en.wikipedia.org/wiki/Polyglycerol_polyricinoleate