I guess I'm either lucky or stupid I'm not sure which. i read quite a few posts that keep very austere kits. I don't work in an office bulding anymore and cars are kept in the clear.
We have a system and a plan. The plan is based on a worst case situation, (whole world goes to hell in a handbag), The system is designed for stages.
I have a tool box in my truck with more than enough for five people for five days. My wife's Montana has enough for five people for three days.
we have prepositioned supplies like a 1964 popup camper with stoves, lanterns fuel bedding and food..
A trailer with food, additional ammo, shelter, and other supplies.
my wife and I have checklists, rondivous points and communications.
I can't give you 10 items.
Our thoughts are plan for the worst and hope for the best.
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What you know isn't as important as knowing what you don't know