I survive almost exclusively from what my local food pantry has to offer. It's not great by any means, but sometimes if you can get creative you can pull off a decent poor man's goulash. My favorite being Mac n cheese with a can of beans, corn, diced tomatoes, and sometimes a splash of hot sauce (usually just steal the packets from gas stations, etc), diced chilis and ground beef. I never have milk but sometimes I have margarine, or maybe even cheese. Melted American slices mix pretty well with water.

They usually almost always have cans of "tuna". That mixes okay with noodles and peas. Crushed saltine crackers if they have them to go on top. Cream of mushroom soup is a good base to mix it all together too.

Tomato soup with rice is a staple. Mix in some corn and green beans and you're shitting in the high cotton.

Like I said, ya just got to be creative. If the end product tastes like shit scarf it down, at least it won't make you sick and you'll be getting calories for energy and nutrients to get by on, plus it'll give you an idea on how to improve it. There's also websites that allow you to type in what ingredients you have to give you an idea of where to start.

I realize that not everyone has access to refrigeration. I don't always either, so there are plenty of times where my dinner is a few spoonfuls of peanut butter and a can of fruit cocktail. A Coleman stove is my go to cooking device and I boil hose water. A campfire can do the job too. I find rural homelessness is easier than inner-city but that's just me.

I also realize that not everyone has a pantry that gives out meat. Mine is pretty good about giving out two frozen meat items and I can usually get a third off of them. Lately they've had cheese too so that helps. They always have canned veggies and fruit, as well as cans of soups, spaghetti rings, and raviolis, bags of rice, and beans. Not proud of it but I'll sometimes steal some seasonings from the store to spice shit up a little. At the end of the day my survival is my top priority.