The technology for using water as an energy source is advancing. Take a look at this short six
minute video from the 2008 Consumer Electronics Show. There are a variety of applications for the technology and
techniques.
As in many areas, there are sometimes exaggerations of capabilities and results. If you spend
time learning about the subject of using water as a fuel source you will come across examples of claims that proved
to be false. An example of that seems to be Stanley Meyer's water fuel cell.