Build your own solar panel. 9Image of aligning the Solar Cells on the window)
This shows you how to make a solar cell phone charger. I was lazy and just bought one, but this looks cool-- and you're reusing the Altoid box!
Instructions for making your own solar panel charger.
You can use electricity to split hydrogen gas out of the water similar to the process called electrolysis.
DIY Build Your Own Bike Generator - NoE
HHO Hydrogen Generator
New aluminum alloy stores hydrogen
(Phys.org) —Chemical engineers at Stanford have designed a catalyst that could help produce vast quantities of pure hydrogen through electrolysis – the process of passing electricity through water to break hydrogen loose from oxygen in H2O.