As of yet I haven't heard of any completely water run cars however you can get a water fuel system that will produce a gas called HHO from water and that will allow your car to run more efficiently for my car (2005 Kia Spectra) it improved my mileage by 60%
http://www.squidoo.com/how-to-get-fuel-from-water
Food and water
No, there is no combustible substance there. However some car companies have concept vehicles that use hydrogen as a fuel; Hydrogen is a gaseous mix of water and oxygen.
No, water is not a fuel.
Bio-diesel possibly or maybe we'll just have to use solar energy and Hydrogen powered fuel cells (the water produces electricity for the car)
We use it in a car
There is no such thing as a water fueled car. Even steam cars used some form of fuel to create the steam. You can extract Hydrogen from water to power a car but as of this time 2015 there are no cars being produced that use water as a fuel.
if we do not use fuel properly our car will destroy
Yes, you can use unleaded fuel even if your car calls for super unleaded fuel. These are essentially the same kind of fuel so it will not mess up the performance of your car.
An energy efficient car can use gasoline, diesel, CNG, or electricity as a fuel.
A fuel cell operates on the principle of reversing the process of electolysis of water. The fuel cell recombines hydrogen and oxygen to create energy and water.
A top fuel funny car can use up to 15 US gallons per pass
no you can't.