Fuel cell technology separately uses hydrogen and oxygen along with a catalyst to release electrical energy (that powers a motor for movement. One would require a great deal of energy/cost to first break H2O (water) into hydrogen and oxygen and then use this in the fuel cell thus making it non-viable commercially.

Answered by vinoo , an ibibo Specialist, at 7:45 PM on September 27, 2008

Right now there is no technology to run car on water. The fuel cell technology which promises to run the car literally on water is under development and hope to see in the market soon.

Answered by Vinay Kiran , an ibibo Specialist, at 9:27 AM on September 23, 2008