Using electrolysis you can separate hydrogen from water, and a catalyst such as sodium sulfate may be used to increase the conductivity of the water to make the reaction go faster. Note hydrogen atoms will float above the water because they are less dense or more holly than water.
You can even buy or make a hydrogen welding torch to harness the power of your newly made hydrogen, but be careful. Hydrogen burns hot, may explode and can be dangerous.
"The ELECTROLYSIS OF WATER"
http://www.docbrown.info/page01/ExIndChem/electrochemistry02.htm
"What is Electrolysis?"
http://www.gcsescience.com/ex3.htm
"Electrolysis"
https://en.wikipedia.org/wiki/Electrolysis
"Electrolysis is the decomposition of a compound using electricity:"
http://www.s-cool.co.uk/gcse/chemistry/electrolysis/revise-it/electrolysis
