Fuels Of the Furture?

What do you think the fuels of the future are or gonna be?
I think Fuel Cells Could Work,i read this some where on how it works. The fuel cells join with hydrogen atoms and create H2O=Water. We all Know Water is something we can drink, so next time your thirsty for something to drink, just pull over and put a cup under the tail pipe!
You got yourself some fresh made water!!
I also have read about hybrids. It's more fuel effciant,but still polluetes the air right?
Link To See How Hybrids Work:
http://auto.howstuffworks.com/hybrid-car.htm