If you're serious about this...
Buy 3-4 boxes of pasta ($6)
Pasta sauce ($2.50)
Couple veggies that you like (peppers, mushrooms, onions, etc. ($4)
Gallon of milk, I prefer almond milk ($2.50)
Dozen eggs ($2-3?)
That'll have you eating pasta and eggs for a week, the veggies you'll be able to sautée and mix into either your eggs or the pasta sauce.
I even left you a couple spare bucks to go pick up a pack of rillos, but I know your broke ass got nothin to smoke