Diet is quiet relative to each individual. For me personally trigger food is usually sugar, fruit, oily food, caffeine, wine, canned tomato, too much fibre and most preservatives.
These foods have been good fresh eggs, fish, chicken, avocado, lettuce, cucumber, carrots, pumpkin, white rice.
Keep things really simple, try stay away from sauces and spices until you can identify which ones can cause issues. For drinks stick to filtered water and herbal tea.