Eating on a budget has a bad reputation it doesn't fully deserve. The cheapest foods — oats, eggs, rice, beans, lentils, frozen veg, whole chicken, seasonal produce — are also some of the healthiest and most filling per pound you'll find. What blows the budget is usually the convenience stuff, and the food that rots in the drawer because there was no plan.
This builder puts together a week's grocery list around a budget and your basic targets, leaning on the cheap staples that actually feed you, so you buy what you'll use and skip what you won't. Just try it — set your basics and it'll build the basket. Your wallet and your fridge will both look tidier by Sunday.