Split water molecules into hydrogen and oxygen and run your car on water! Water can not burn unless the molecules that make up water are split into hydrogen and oxygen gases. Learn how to build an electrolyzer fuel cell. We will teach you how to get fuel from simple tap water. You can then apply this knowledge to run any gasoline engine on water ( hydrogen ). Run your truck, car, lawnmower on water ( hydrogen on demand ). Any gasoline engine that uses pistons can be made to run on hydrogen!