Something else to consider: In densely populated areas, that 3 day supply of food and water is not going to cut it. The shear number of people are going to overwhelm any relief efforts and surviving infrastructure.

http://news.yahoo.com/exasperation-builds-day-3-storm-stricken-nyc-202314418.html

How long should do you plan to be sitting pretty for?
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Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane