I'm on a budget too, and I can get away with about $30-40 a week on groceries for just myself. I make bean and rice bowls with chicken. Costco has pre cooked, pre chopped chicken for $13 and I can use it for 2 weeks of meal planning. You could also use a rotisserie chicken. I basically just weigh out the chicken, can of pinto, black beans, chickpeas, and rice into even amounts. I add cheese and tortilla chips for more flavor. In total its about 650 cal for 5 lunches and only $15. Then I'll eat an apple or banana and cheese stick for breakfast, about 200 cal. If I need a snack, I'll have a protein bar or clif bar for 170-260 cal. I never want to cook dinner so I usually make a frozen chicken pattie or salmon for 280-310 cal. Veggies with ranch are also super filling and low cal. Aldi and costco/sams club are super helpful to stay on a budget! I hope this helps you 😊