Cheap FODMAP meal planning

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So question: I mostly eat tropical things out of habit; plantain, pineapple cider, taro stem, sweet potato leaves, tamarind, salsa without onion, rice, veggies, some more "expensive" items like aged cashew stufd etc... Out of habit (lived on tropical homestead for five years) but now I'm in a different situation where I can't spend much anymore.

What does cheap eating look like with basically no legumes other than tempeh, tofu, soy milk and bean sprouts (FODMAP scales them as lower); no grains other than rice and I think oats and minimal dairy?

FODMAP limits my ability to eat pulses and wheat without serious consequences (I don't have celiacs, rather IBS with sensitivity to galacto-oligosaccharides, lactose and fructans) but I was trying eat cheaply by making loaves of bread from bulk flour and eating beans and greens with butter and my digestion suffered for weeks. I was hoping that maybe my symptoms were in my head but that's not the case.

Also it's been a month with a refrigerator after years without and I gotta ask what vegetables that aren't expensive last well with refrigeration that I can buy in bulk?

Anyone leave vegetables out room temperature outside the tropics? What does best?

Also in lieu of garlic and onions what do you suggest seasoning with?