I use this: http://www.amazon.com/gp/product/B0077RAUTA?psc=1&redirect=true&ref_=ox_sc_sfl_title_2&smid=ATVPDKIKX0DER
In combination with 1/4" ice maker line, small pump and "anti-siphon" junction and put that on a timer alternating between when your hydro system feeds and you're set. If you're...