To convert your car to run on water, you will need a simple inexpensive guide, as well as some parts from your local hardware store. There are TONS of guides out right now that teach you how to do it. Overall, however, the one I would recommend the most is Water Car Pro, simply because it’s the easiest to follow. Odds are, you have little (if any) knowledge of how car engines work. Therefore, you’ll want to get the guide that is easiest to follow. There are also other guides out like Drive Water and Water 4 Gas, but these are harder to follow.