Sadly, being well prepared with clean water, food, medicine and shelter does you no good if someone else takes it from you. The very first item on your list should be a powerful firearm & sufficient ammo.
Lucifer's Hammer by Larry Niven and Jerry Pournelle has a pretty good take on the post-apocalyptic chaos & breakdown in society that will likely ensue.
Agreed. But ... California makes that tough. Oregon & Washington are more in line with the rest of the country. Something to check is whether your state restricts carrying when a state of emergency has been declared.
Lucifer's Hammer by Larry Niven and Jerry Pournelle has a pretty good take on the post-apocalyptic chaos & breakdown in society that will likely ensue.