As someone on FODMAP, what works for me is to do breakfast/lunch meal replacement with low FODMAP shakes (like Huel), then get a few FODMAP cookbooks and make dinners out of that. Works great and is fairly painless - lots of delicious meals can be made that are low fodmap, fortunately. It's really difficult to avoid FODMAPs when eating out, western food loves onions and garlic for instance - for these cases, I use alpha-glucosidase enzyme tablets (I take 2x 350mg tablets with a meal).