The book “One Second After” is about a hypothetical EMP strike that’s supposed to be pretty sobering. It’s on Kindle but I haven’t read it yet. I suppose the most important thing is stored food and water.
That is a VERY sobering book. Realistic enough to make you really think.
Here's a link. Foreward by Newt Gingrich.
Read this book and you'll think twice the next time you're in the grocery store.
The must important thing is living in an area that can be isolated from the hordes of human locust . And there aren’t many of those. Having food and water will make you a target if they can reach you. Actually the most important thing will be luck, because huge numbers of people would be dead in 6 months.