My wife has an Oxygen concentrator because she's on it 24/7/365. She has small tanks that last up to 2-1/2 hours when we go out. Of course we also have a generator so there's always oxygen for her.
I just got a grocery order and I'm seriously going to have to stop hoarding. Tomorrow I'm going to clean out that pantry and get all the older stuff to the front. I had to move my flour and rice hoard to the hall closet.
This is the closet in a spare room: Note the MM/YY "Best By" dates, most noticeable on the cans. Any day I wet my pants because "my food supply exceeds my food storage" is a good day. ps: You see the alcohol on the top right? I got bottles of wine in another location. I don't even drink...that's all for cooking. You ain't lived til you've made a sauce for fish using vermouth instead of white wine.