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Sure thing!
The chemical formula is , You can buy the carbon in pharmacies (ask for activated carbon)
Hydrogen can be found in water, but it is bound to oxygen, so you need to introduce some electricity to it so it is separated. (the stuff coming from your wall is fine).
Lastly, Nitrogen can be obtained from widow-cleaners, simply boil it until you the liquid evaporates and theres a thin layer on the bottom of the container.
I hope this helps!
