It's good to have a solid set of survival skills, but you can't be expected to remember everything. The Art of Manliness put together a collection of books for your Kindle that will help you survive virtually any scenario.
The Kindle is ideal for a survival toolkit: you can pack it full of knowledge without taking up space, it has a long battery life, and it's durable. (Obviously you'd also want a solar charger of some kind as well for long-term use). Which books you deem necessary is up to you, but head over to The Art of Manliness for a huge selection of survival books worthy of your Kindle's library.
Build a Bug Out Kindle: A Digital Survival Library at Your Fingertips [The Art of Manliness]