Any cooked cereal should be fine, like Cream of Wheat, oatmeal, cream of rice.
Stay away from high fiber foods for right now, also stay away from spicy foods, tomato based foods, and fatty foods.
baked potato of any kind is good, so is squash, pasta of all kinds with bland sauces should be okay.
cooked fruit digests easier than raw fruits. Ditto the veggies. cooked carrots, peas, green beans, all are pretty bland and lower in fiber than the raw versions.
Don't eat large amounts; many small meals through out the day are better. dont get too full or too empty either.
You can take Maloox for it. That helps a lot and is often prescribed by the doctor and should be vegan. Just follow the directions on the label. It is available in most any drug store.
Drinking chamomile tea with your meals is soothing to a sour stomach and it is also a natural digestive aid.
Avoid any caffeine right now.