The man is fooling the nation. And now people say that the government won't release this awesome technology of the hero! I'm ashamed to see Engineering students spout this nonsense. You can't use water as fuel. What he's saying boils down to this equation:
2H2O given 4H+ and 2O2-. This Hydrogen then reacts with oxygen to give water and heat. The equation is unbalanced, heat on one side. It breaks the first law of thermodynamics by creating ENERGY.
The difference between this and petrol is that, in petrol we get Co2 and H20 from CH4. Thus, we're not getting the same thing back.
Also, if the H20 is giving energy in every reaction, then sooner or later, if we keep repeating this process with the same water, it will lose all its energy. This is also impossible.
I almost forgot one thing, you can't electrolyse distilled water without an electrolyte. I'm assuming he used tap water, containing salt though but the energy would still come from the battery
And lastly, the dude's a graduate from a polytechnic institute, not AN ENGINEER