Plenty of canned food, soups, tuna, vegetables, protein bars. You can even add in needed supplies like socks, soap, etc
Discussion
And Iโm using โvending machineโ for lack of better word. There may even be something better for this type of application thatโs more simple and less costly to securely distribute goods
How do you cook canned food while homeless? ๐
Itโs usually cooked already but I really appreciate you playing devils advocate on my ideas. Sometimes I jump the gun on these things and can always use someone to ground me. My idea here Itโs definitely not a perfect solution. But we can certainly keep thinking here
Easy 
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Build a custom vending machine with a microwave built in. 1 sat per sec.