Car that runs on water

Common topic of discussion for Steven Hyde (Danny Masterson) on "That 70's Show" while in the circle smoking pot.

Basically what he's talking about is a car where you put water in the gas tank instead of gas. The demand for water would be so high that everyone would buy all the water, leaving us with nothing to drink except beer-and the government hides the car from the public because they know that beer will set us free.