How about a car that runs on water?

It has been a long winter.  I need exercise and I want a pedal car.  Yet, there isn't an acceptable model.  This could have been a good alternative since it doesn't use gas.
http://www.dispatch.com/content/stories/local/2007/07/08/hydroman.ART_ART_07-08-07_A1_4V77MOK.html

This image is from Popular Mechanics.  Popular Mechanics