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Powering cars with water is something that the oil companies are hiding... so they can make money off the people.
The physics that they teach in schools is only a sliver of how things really work.
Wouldn't it be neat if a person could eat a little WM shrimp, and then blast off from his toilet like a rocket to the moon?
You are probably the only person on this forum who would deny the law of gravity if there was a good excuse and opportunity to do so, really.
Water cannot be used as fuel because hydrogen (which is actually a fuel) cannot be obtained from water without investing electrical energy to separate it from oxygen, it is basic chemistry, one does not even need to go college and get a title in chemistry or engineering to realize why one cannot use water as fuel without opting for nuclear fusion, we are talking of combustion not fusion.
Have you ever heard of the expanding universe? Science has known that the universe is expanding for a long time. In fact, the expanding universe is what the whole idea of the Big Bang is all about.
There probably isn't any gravity. It's all inertia. It feels like gravity because we are expanding with it. Check out Neal Adams - Science: 01 - Conspiracy: Earth is Growing! - https://www.youtube.com/watch?v=oJfBSc6e7QQ.
There is a whole lot of stuff about science that the universities hide from us as much as they can. Water is H2O - hOh. But there is a form of water that acts differently than standard water. It is H2O in the form 'hhO'. There is a difference.