Danish company HUMAN HABITAT has developed a hydroponic garden system that requires just 538 square feet of space to grow fresh food. It is called IMPACT FARM and could be the beginning of a commercial farming revolution.
you could add some fish to your water reclamation tank for a small aquaponics system. Grow a few plants to feed the fish and this forms a closed system. There is no need to fertilize, the fish do it for you! Permaculture at its finest!