Growing up dirt poor, we raised rabbits for meat. They didn't require much work or space and the meat was pretty good though very lean. We usually had five to eight bunnies of various ages in two raised pens five feet by four feet in size. The rabbit food must have been cheap, but I don't know what you'd do if the food weren't available, especially in winter. You can't let rabbits go free-range like you can chickens.

We lived in town so chickens weren't an option. If I were setting up a retreat I'd go with chickens. They'd supply fat and eggs as well as garden pest control. Of course around where I live now feral pigs are a huge problem (and wonderful source of food).

-Blast