Practical Doomsday: A User's Guide to the End of the World

This book is unsexy but very realistic and practical. It's more about the basics of preparing for disasters, such as saving money in case you lose your job. It does move into other areas, but remains focused on more likely disasters, and although it does mention guns, it is generally opposed to them, because for most people and under most circumstances, it is more of a problem than a solution. If you want to encourage friends and family to take quite reasonable measures to prepare for disasters, this is my go to.