You have hit the nail on the head. I was thinking of ziplocks of hydrogen and oxygen which I could merge. But, instead I tried just plain air and then condensing it. The problem is that when you get rid of the water it does not come back into the baggy. So, then I tried an aluminum foil cover on a pot over the stove (propane at home) to capture the water.
As a result, I actually burned myself. And, the ziplock bag almost caught on fire (it actually did, but I was able to put it out).
So, thanks to your referrals to those websites I will just buy the bottled reconstituted water container and count my blessings before I kill myself, or more severly burn myself in this alchemical endeavor. (By the way I am now trying out the bean sprout in a baggy idea for trail salad and starting my first tests with mung beans and alfalfa seeds.)