Survivalists and preppers everywhere all know the same thing. These things we see around us could very easily change in an instant. In the event that the power goes out, the grids are down and regular supply lines upon which we rely are no longer available to us, having a store of supplies and rations seems like a good idea to the forward thinking mind.
Preserved foods last many months, years and even decades. But the various options like canned foods, dehydrated foods, MREs, jars and freeze-dried foods all have different advantages and considerations that make them better suited to the survivalist.