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Aside from the obvious need to prepare for anything: keeping extra water, food, first aid supplies, etc. on-hand I have always kept a fairly well stocked library. A lot of my library has come from many trips to half-priced book stores and such. How-To books are my favorite.
If the internet suddenly becomes unavailable for an extended period of time and I need to know how to do or fix something around the house or on the vehicles, I have done as much as I can to cover all those subjects in the library. Pulling up and storing your cars service manual; keeping a handy book on plumbing, electrical and even mild carpentry skill might save the day in a pinch.
Of course all work and no play and such, be sure to stock your library with some fun reading also. A world almanac and other books of facts are handy also.