For me, I would load food, water, guns, and family into my truck and head to a nearby marina that has a massive floating dock. Occupy floating dock, boil water for extra water, fish and search nearby stores and restaurants for food. Barricade walkway to dock and if needed disconnect dock from shore.
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I already live on the high ground, so my plan would be to make to to the coast line, steel a boat, make it to England, hopefully meet my family on the coast and access the situation. I always wanted to hold it out in a shopping mall with plenty of supermarkets for food, like dawn of the dead.