Comment: get a can opener

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get a can opener

Mechanical kind, not electric. Otherwise, turn can over and rub the top vigorously on some concrete to wear out seal.

Lack of air kills you first, followed by lack of water, followed by lack of food, then shelter. The order changes slightly in some circumstances. Extreme cold can kill before lack of water if not prepared. Prepare accordingly but also consider exposure to risk. Most people store water but if you live close to a chemical plant, perhaps gas masks and rebreathers should be higher on the list.