Make sure you have drinking water for several weeks. A large fraction of the deaths after Hiroshima was because thirsty people would drink the "black rain". (Th

Make sure you have drinking water for several weeks. A large fraction of the deaths after Hiroshima was because thirsty people would drink the "black rain". (The fallout caused water in the atmosphere to condense, causing it to start to rain, and the rain was black with fallout.) Anyone forced to go outside to find drinking water over the first few weeks have pretty poor odds, if the water contains fallout.