If you don’t own land in any form it is time to learn how to grow a garden in pots.
It'll work for a while, but eventually everything will be stolen. It's easier for people to steal food than to grow their own (sort of like food stamps). In addition to a temporary garden, learn to find edible wild plants and how to trap. Because others won't know what's edible, you'll have all the wild food in the area for yourself and your family.