Here's a recent thread on YouTube about the safety and convenience of using water as a fuel. I don't own any of these accounts: Here's How it All Works In short, you convert water to HHO gas with the help of electricity from your battery. You place a small water container (quart size) under the hood. You fill it with water (tap is fine, distilled has less impurities) and a little bit of baking soda. The device gets vacuum and electricity (12V) from the engine and produces the HHO gas. See the video below for a quick demo: Get the Flash Player to see this video. The HHO gas is supplied to the engine's intake manifold or carburetor in a simple, effective and safe way, like in the video below: Get the Flash Player to see this vid...