For our emergency food supply, my preferred approach has been to stock up on canned food, instead of dried or freeze-dried food. As we eat some of it we replace it with newer cans of the same. The reason is because most canned food, such as vegetables and fruit will last many years past their so-called expiration date listed on the can, since the metal is a better container for preserving their contents than either plastic or cellophane.
Also, the canned vegetables and fruit are packed in potable water which is another very important fact that many folks tend to overlook. Who knows what situation(s) may exist in a SHTF scenario and what condition our municipal water supply will be in. Therefore, the nourishment from both the canned food AND the water from the can, will have double benefits for our sustained longevity, (of course, until it is all gone.....)
BTW, I also have sealed canned water, which will last longer, that is remain potable longer, than water in sealed plastic containers that will eventually leach some of their unhealthy plastic chemical compounds into the water after approximately two years or less....
AVB-AMG