Just an add on to consider. bottle or concentrator is heavy. I am on oxy 24/7. Batteries for those last about 1 hour, and the units are around 20 lbs. To rent or buy legally you need a prescription. You can get one on the black market, generally used and abused. So there is the downside.

Exercise and get up there a few days earlier, forget the playing around with oxygen carriers. You can get too much and it can really screw you up.

Remember why, specifically, the Bill of Rights was written...remember its purpose.
It was written to limit the power of government over the individual