HHS purchases $290M worth of drugs for nuclear emergencies
I carry a pack of KI in my EDC backpack and a second in my checked luggage.  I figure with the amount of travel I do, my odds of having "shit pop off" when I'm traveling are pretty high (rather, the odds of it happening are low (<1%/yr, even this year), but if it is happening, it will most likely happen during travel/away from home).  I've got an AirBoss gas mask, bug out bag, firearm, 2 weeks of food, 4 weeks of water cached (or more) in a few client offices around the US.