1. If you are buying garlic infused oil, make sure that there aren't floating bits of garlic in it. You can also easily make your own garlic infused-oil by frying garlic cloves in oil, when they are golden and soft you need to remove them from the oil and continue cooking your meal. (This is a low FODMAP way to get the garlic flavor in your meals, as the fructans can't leach into the oil.)
2. Buy chickpeas canned in water or brine (he oligosaccharides will leach into the liquid, this will reduce the FODMAP content). Always rinse the chickpeas before cooking.