Even without a fridge, you can replace lots of take-out meals with things prepared at home, just with a container that seals to keep out bugs. A loaf of bread and a jar of peanut butter. Bananas. Eggs. Canned tuna.
If you have some method of heating, you can add pasta and rice and beans and oats and sweet potatoes and lentils.
If people are really lacking these tools, I'd be happy to write a check to a New York charity that provides them.
What's the solution to the security problem? Why would you buy a mini fridge or a hotplate if some crackhead (maybe even your mom or her boyfriend) was just going to take it and pawn it. They already have enough issues just showering safely.
No, this isn't a technical problem. It's bigger than that.
Yeah, I goofed by listing them in the heatless category. You can short-term store them without a fridge, though.
Obviously none of the things I listed will form a complete diet, but if you are eating mostly take-out they are probably a superior substitute for some fraction of those take-out meals.