FEMA says you need a 72-hour emergency kit. They’re right. Their list is a reasonable starting point. It’s also missing half of what you actually need if something serious happens. The standard FEMA recommendation — water, food, flashlight, first aid, whistle, dust mask, plastic sheeting, duct tape, moist towelettes, garbage bags, wrench, manual can opener, local maps, cell phone with chargers — keeps you alive for three days if the power’s out and you stay home. It doesn’