I lived for a year on a narrow spit of land between a large bay and the Intercoastal Waterway in N.W. Florida. We were hit dead center by two hurricanes, Opal and Erin (just after Andrew passed). I learned quickly to keep cases of bottled water under the beds, and that thirty gallons of good water resides inside the hot water heater after the water service and power are interrupted. The water we used for washing was recycled into the toilet tank (which we stacked bricks in to reduce the volume needed per flush). Our longest without utilities was about ten days, if I remember correctly.
After that experience, I purchased two five gallon potable water jugs from Wal-Mart and keep those on hand all the time, even though I don't live in "Hurricane Alley" any more. Even here in S.W. Tennessee, there are plenty of times I have been without flowing water due to water line interuptions, either from the utility or my home service line. I still keep at least a couple of cases of bottled water (6-one gallon jugs to a case) in a closet or under a bed.
Likewise I have kept oil lamps, fuel and spare wicks ready in every room. I get bored sitting in the dark listening to the radio! Also, a small propane camp stove makes for a welcome warm meal when the power is out. The same cylinders fit lanterns and radiant heaters too.
Codger