What is a Hydro Powered Car?

What do you think of when you see the term "hydro powered car?" Do you picture the high-tech hydrogen powered cars being developed by companies like BMW? Or do you think of a car that somehow uses water instead of gasoline as fuel? Or perhaps one of those old steam-powered monsters that inventors tinkered with 100 years ago? When I think of a hydro powered car, I think of something slightly different, a cross between an all-hydrogen car and one that somehow uses water as fuel. You can call it a hydrogen-gasoline hybrid. Many people just call it a car that runs on water.