In the overall plan for emergency preparedness, there are three main areas that need to be focused on. To put it in an easily remembered way, I always say, "Beans, Bullets, and Bandaids." Each of those items representing a big area. Beans, meaning food and water. Bullets, meaning guns, ammo, and all related gear. Bandaids, meaning medical and first aid supplies. There is a lot to cover in each area, so click on the link for each one to find out more.
Things dealing with preps that don't fit those specific areas can be found HERE.