All Right

I know for a fact that you can turn water into hydrogen and oxygen through the process of 
electrolysis, i know what that is and how to do it, but what i really need to know is the details of turning hydrogen and oxygen back into water.

 I have some ideas on how this may work, but i have no idea how to back those up with any proof (you see i have no way to get hydrogen, and i don't want to try electrolysis because i only have access to copper cables, which will contaminate them, and i cant afford platinum ones) so as much as i hate to rely on others findings, i would very much love it if someone could tell me the logistics on turning H and O into H2O.

~backgroundwhitenoise