Huffman, who lives in San Francisco, has large blue eyes, thick, sandy hair, and an air of restless curiosity; at the University of Virginia, he was a competitive ballroom dancer, who hacked his roommate’s Web site as a prank. He is less focussed on a specific threat—a quake on the San Andreas, a pandemic, a dirty bomb—than he is on the aftermath, “the temporary collapse of our government and structures,” as he puts it. “I own a couple of motorcycles. I have a bunch of guns and ammo. Food. I figure that, with that, I can hole up in my house for some amount of time.”

Popular at this particular show were bug-out bags, the vendors tell me, because the casual interloper can purchase a lot of peace of mind all at once. For $449, Lenexa, Kansas retailer Game Plan Experts sells a bag with waterproof matches, a flint fire-starter, energy bars, utensils, a camp stove, water pouches and filtration, a first-aid kit, masks, a survival whistle, a pry bar, a folding shovel, an emergency blanket, toilet paper, a toothbrush, a hand-crank radio, survival candles and more. For the über paranoid, they’ll find a discreet contractor in your area to dig a hole in your yard and install a doomsday bunker. 
In practice, the process can be a bit tricky. Freeze-dried meals require that you have potable water lying around, which might not be the case in the event of a serious calamity (some Wise Company kits include water purifiers). The cooking instructions for the Wise products I tested call for using the entire four-serving bag at once, which means that you have to have a container on hand to store what you don’t eat, and a fridge to keep it from spoiling. Even at my office kitchen, the only way I could make it work was by pouring about a fourth of the packet in a mug, filling it with water, and putting another mug on top of it.
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