Most of us are familiar with the running jokes about "what do you do with a fruitcake"...
Leave it on the neighbors porch, next to the sack of Zucchini.
Make bookends for all of your shelves.
Mail it back to the person who gave it to you last year.
...
It turns out that they may be edible. I know, shock and possible horror.
From the prepper standpoint, think about the long term storage life, seriously.
They are also reasonably high calorie and, if made with nuts (not by nuts) offer a more balanced nutrition profile.
Put the humor (I couldn't resist) aside and read this article:
https://survivalblog.com/fruit-cake-crazy-nmsourdough/#more-53999The article contains some actual serious recommendation for fruitcake, so do read it.
It also ends with more tongue-in-cheek recommendations...