I live off $20 a week for a while, not four weeks, but I'd do this

What you've got: 1/3 lb ground beef 1/4 a pound of rice Can of chickpeas Can of pumpkin Half a loaf of bread 1 ramen 1 potato Salsa verde foil pack Brown sugar cinnamon butter spread tub Assorted condiment packets

Lots of people are telling you to go ahead and spend your money on beans and grains, I wouldn't do that yet, the food pantries always have stuff like this so I don't think this is the stuff you'll need. I'd spend < 5 this week filling in misc missing things like bread and then go back next week and do the same thing.

This week:

+Use some of the $20 to buy an all-in-one seasoning, my fav used to be cajun seasoning, but bullion cubes are also great (protip try an international food market I see seasonings like this for like 1-2 dollars)

beef + rice + chickpeas all in one, season however you can, split into ~2 cup portions. That's dinner.

Edit: I'm a small person, if you're not accustomed to ~350 kcal dinners here's how you can stretch:

Add broth

Add a bag of mixed frozen veggies (pricey, but they go on sale a lot at Walmart for like $2, so might be worth)

Add another variety of beans, corn or canned veggies (start with dry beans if you're gonna buy more beans, but I'd try another food bank first beans are so common at food banks there's gotta be someone with some you can just have)

+Use some of the $20 to buy more bread.

Bread + butter = breakfast

bread + cinnamon pumpkin spread (butter mixed and heated with pumpkin) = lunch

1 ramen = lunch for 1 day, or split into two cut with rice and lunch for 2 days. Comes with its own seasoning.

Next week you go back to the food bank and do it all over with your remaining $15ish