Considering the only big thing I have to worry about short of the collapse of society is extended utility outages (fortunately I live on top of a hill 270' above sea level and in a non seismic zone so flooding and earthquakes aren't a problem,) I've thought about getting one of these
WaterBOB: emergency drinking water storage to store water just in case. If the water isn't back on by the time the 3 of us use up 100 gallons of water, we're idiots and should have evacuated earlier.