There are really a lot of guides out now that teach you how to run your car on water. I guess that’s a good thing, but it does make you have to think harder when getting a guide. There are no totally free one’s that I know of. However, the one’s that are out right now are definitely worth getting. Water 4 Gas is the most popular, and uses fairly standard technology. I think water car pro and drive water (2 other popular one’s, but not AS popular) are a fair bit simpler and contain less information.