Grow and dry Duckweed for rabbits, poultry, fish and other veggie munching livestock. Duckweed can double in growth every day which gives a sustainable source of food for little effort. Also VERY high protein content.
Raising Tilapia - Easier Than You'd Think If you had Tilapia and chickens, goats (and maybe a cow or two) for milking, a garden and some fruit and nut trees... these are some of the things my dream home would have. :)