*IF* he could get to a grocery store, he would have access to a whole lot of good stuff. Most stores have BOGO deals, and while it's an investment, you can also get a whole chicken at a lot of stores for fairly cheap (it will feed you for a few days if you play your cards right). Scrounge in the almost-expired area and you will find stale bread (croutons? stuffing? breadcrumbs?), dented cans (canned veggies + chicken, or use broth for soup), and cheap pasta (soups, sides, etc.). Ask for samples at the deli counter and they will usually let you try a few kinds of meat/cheese (but you'll have to eat it there). Ramen will work for cheap and easy pasta (discard the flavor packets; they will just make you ill over time). Store brand butter is very cheap and will give you a way of browning that chicken. Nab some mayo, ketchup, mustard, salt, and pepper packets (and some plastic spoons and forks while you're at it). Really keep your eyes open for things that are super cheap. There are a lot of them. Some stores have bunches of bananas that are almost black (still good and a bit of a treat as a dessert). Look for coupons, especially for frozen fruit/veggies, which still have the nutrition but not the short shelf life of fresh ones. Coupons are also good in the baby aisle, as you can get small packs of cereal and baby food for free if you are allowed to double coupon. These are fairly nutritious though they work best on dessert-style baby foods (bananas & tapioca was my favorite). Back to veggies: potatoes. SOOOOO many ways to make potatoes. Shred them for hashbrowns, boil and mash them, bake them, fry them, au gratin with cheap cheese and the aforementioned stale bread topping. A five-pound bag is still pretty cheap in most stores and can last you awhile.
All of that aside, yes, I would have helped out with this if I'd seen it but it seems the OP has gone on their way to go find some food?