Try to use electrolysis and some stor + pipes to separate the hydrogen from the oxygen.

*Flies away*

Example of usage PIPE + STOR to get HYGN:

Basically: The stor stores elements, if it has a ceirtan ctype, it will only absorb that one, if it absorbed something and is near PIPE then it will transfer it to the pipe, essentially making a HYGN gate.

Electrolysis can be pretty easy if you use sponge, it can be done in 0g if you lead the water directly to a iron and gold lattice, hygn and oxyg can travel through it but water cannot, you can then do what tudor said with the stor.

you can also turn deut into hygn if you have two chambers of exploding deut, and a slit in each one. the neut slit leads to a large glass tunnel, which will create photons, the photons then go up into bizr, which will turn the photons into electrons and the proton slit will lead the protons right into the electron output, i've tried making this but it's way too difficult for me lol, you might be able to though 

just get a bunch of ELEC on water