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!
How to Build a Homemade Hydroponics System Cheaply. Not all hydroponic systems are good choices for a homemade system. Here is a cheap and reliable way with excellent results. It is a homemade ebb and flow.