If you remember the fast-zombie movie, 28 Days Later, there was a scene where the survivors find a supermarket and load up. One of the interesting things in the scene was that the irradiated produce held up much better than the non-irradiated. On a side note, irradiated produce is far more common in Europe than it is in the US because, it seems, we in the US have a knee-jerk reaction to the word ‘irradiated’. If you knew how much stuff in this country is sterilized through irradiation (esp. in the medical industry) I think you’dbe quite surprised.
Anyway, its a trope of apocalypse fiction that survivors either a) find supermarkets that are looted and beyond salvage or b) spared from looting and are treasure trove of unimaginable stores. Which raises an interesting question: if you had a supermarket all to yourself, how long would you be able to survive? Well, someone did the math:
I very much like the fact that they address the issue of food spoilage for the dairy and deli counters. But I think that if you hit the home canning aisle, and then the housewares aisle, you could at least get enough gear to water-bath can some of the produce. If they had a pressure canner on the rack in the home canning aisle you’d be freakin’ golden.
Realistically, I doubt getting locked inside a supermarket is an actual apocalypse thing. Even in post-apocalyptic fiction you’d have to do some pretty deus ex machina to contrive a logical reason for people to be locked in a supermarket (Stephen King’s “The Mist” not withstanding). More likely, you’d have survivors ‘own’ the supermarket and guard it as an extremely high-value resource…assuming they don’t start methodically taking the contents back to their stronghold.
But, if you were forced to stay in a supermarket, how long would you be able to keep from starving? TL;DR = 63 years.
I can’t think of any disaster that would preclude me from being able to otherwise source food for 63 years but…good to know that if I hit the local Safeway as the sole survivor of..whatever…I can cross ‘food’ off my list for the rest of my life.