I've been doing this for a while. You should find a cheap whole stack, computer, os, source code, solar cell, battery, and seal them in a galvanized trashcan with metallic HVAC tape around the lid. This will protect it from high frequency EMP bursts in the upper atmosphere from multimegaton infastructure disruption weapons. Other things you may want to add is a soeks dosimeter..

Laptop computers with a core 2 duo are quite cheap and often come with enough memory to be considerble computers. Take all your home movies and run them through ffmpeg to make them run smooth on old hardware. Find a bunch of videos about making food, soap, how to make a gassifier, grain mill.. think creatively. It is almost time. You know it. That is why you are posting this.