If your going with liquid better to pick the canister up from the filling depot same day its been filled otherwise you could get a bottle thats been sitting a few days already bleeding off.
The canister is a big double walled thermos, never seen the inside of the second wall but I suspect it has tubing coiled around the inner compartment to keep it refrigerated as oxygen bleeds of to atmosphere.
When they fill these at the plant, it's on a demand order they do keep full tanks around waiting to be sold, when the tank is filled with liquid oxygen it take about an hour during the fill theres plenty of liquid oxygen being bleed off cooling the thermos as its being filled.
As you consume the oxygen the product your drawing off keeps the canister refrigerated, if your not using any product the thermos is designed so that as the outside temperature rises it will discharge oxygen keeping the remainder the liquid cool, this will go on until all the oxygen has been depleted by sitting or by consumer use.
Much better to be cutting with that liquid oxygen than using it to cool the thermos down. A regular oxygen regulator will hook up to the thermos from there it's your choice of fuel to use Hydrogen, Acetylene or Propane.
To use hydrogen fuel you need a special regulator.
I have only seen one commercially manufactured generator that split water into oxygen and hydrogen, unfortunately the owner did not demonstrate it's use or elaborate on its capability.
Here's a link to a commercially made generator, http://www.alibaba.com/product-gs/54...Generator.html
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