The Oil Drum

Turn it into fertilizer or aluminum first.

my kitchen stove runs off a 15kg "butane" gas bottle, whenever i see one of these being thrown away I toss it in the back of the van and exchange it for a full one, last one cost about $20 (i'm in uk)

that will last me for about 10 months (i dont cook meat)
so now i have 3 of the babies sat in the garden shed.
NEVER STORE BOTTLED GAS IN THE HOUSE OR AN UNVENTILATED AREA

I also rotate some food stuffs so there is 10kg of pasta, 15kg of Lentils, 200 assorted tins.

all this stuff has shelf life of 2-3 years (cost under $160) so is just a case of rotating your own stock, its pointless going out to do a mass shop when TSHTF

You can sequester it into the ground
if you don't have gas storage tanks
or pipelines to fill.
Of course, this is limited, but a lot
of places have underground storage
facilities for quite a lot of gas.

Guess you just leave it into the ground.