For some ideas you might want to research the Stanley Steamer, built in 1906. This car was powered by water (steam) and from what I have read about it developed massive low-end torque. It's a very old classic car, Jay Leno has one. Anyway, it's a great example of using water to power a car.

2000 Ford Contour SVT, black, bone stock. "The way I drive, I don't need mods!" :-)