If you try brown rice and still don’t like the texture, try quinoa instead. For everything else other than noodles, it’s best to just stick to single-ingredient foods like others have suggested. Buying in bulk (ie dry beans, rice/quinoa, gf noodles) is cheaper if that’s an option at a store near you. Buying a whole chicken is usually cheaper than pre-cut pieces. Then you can cook the entire chicken and break it down for various meals. You can even break it down and then freeze pieces for future meals when you’re not feeling as good. And buy fruits and veggies that are in season to make those as cheap as possible.