1.) Zombie Survival Guide, because clearly it was zombies that destroyed society. (World War Z is sort of implied, as my scavenger legions will no doubt find copies of it on their own and it's not exactly vital)
2.) Show Me How, a visual how-to guide with pictograms instead of written instructions (I'm a visual learner myself so that's a nice touch)
3.) DIY for Dummies. Really, any of the "practical knowledge for dummies" books could fit here, but knowing how to cook a thing isn't very helpful if you don't know how to build a kitchen first.