Finding the right can and planning out your storage system takes some thought. During a gas shortage or any other type of emergency, you will likely need to make some effort to reduce your consumption and get the most out of the gas you have on hand.
Safety of storing gas
Never store gas in your home and near where you sleep. Gas is extremely explosive in the event of a house fire or sparks! A can of gas exploding can turn what would have been a minor fire into an inferno that destroys your home and possibly kills people.
Gas should be stored in an unattached outbuilding or similar. I know that those of you in apartments may want to risk it but realize the possibility of what can happen. If you rent a house and don't have a storage building then consider getting one of the smaller plastic based ones like Rubbermaid makes and storing your gas in there. If you move, you can break it down and take it with you.