Fresh sauerkraut is really good for a finicky stomach.

Pretty easy to make, I keep it in the fridge in a quart jar after stewing on the table for a couple days. Great side dish with lots of food.

Ginger is also good for that. Just eat some fresh or mix in a blender with some honey or xylitol and keep it in the fridge. Yummy too. You can use the ginger mix as a base and add it to seltzer for a zing your tummy might appreciate if queasy.