I have gastroparesis so am currently on soft food/liquid diet with little to no fat/fiber.  I don’t expect you to accommodate this extreme situation and things may improve by the time of our trip.  I can eat low/non fat yogurt but am lactose intolerant and allergic to eggs.  I tend to eat more vegetarian but try not to be picky since I am so limited.  Gluten free toast, avocados, bananas, rice, smoothies, juice and yogurt are my staples.