Use distilled water, it's a buck at WM, and get a smart charger there as well, a Shumacher 6/3 amp is about $30. I've got one and it has the smart technology where it charges it up and then maintains, does not overcharge it. Plug the charger up as soon as you get home, can leave it hooked up if you want/can, the display will let you know if you hooked it up correctly, it's charging, and when its "maintaining" the battery. Good battery maintenance the key to getting good service life from a battery.