Stocking hidden caches of food was exactly the Biblical plan, along with training in wildland survival, and practicing emergency evacuation. These instructions were tied directly to the survival of the nation. It's not literally in the text; it's in what one would have to do to accomplish what is literally specified in the Hebrew. The English translations based upon historic Jewish practice under Greek and Roman occupation, are plainly wrong.
How many are thinking right now of stocking up hidden caches of months or years of food for their families?
In those old days, there was no one buzzing around overhead with IR cameras, or air dropping motion dectors to spot the guys going to and from their hidden caches.