I mentioned previously that you should have a water purifier and a generator in your home, as when the apocalypse hits, the electrical grid will most likely collapse. But, I also recommend getting a battery-operated air purifier. With the abrupt switch in the Earth’s axes, dirt, pollens and other crap will be hurtled into the air and ultimately pose a threat to everyone’s respiratory systems. Cleaning up the air within your home will help to prevent such easily-transmittable ailments as tuberculosis, measles, influenza and gingivitis. It’s a somewhat expensive investment, but critical to your survival. Besides, an air purifier will help eliminate bad odors from decaying bodies and anyone in the house who suddenly develops gas problems.