Jesus Himself said if the wise man knew what hour the thief would come he would be prepared. We know exactly when Y2K is coming. It only makes sense to me, knowing there is a good chance we will be without electricity for two weeks or more, that we should be prepared. It is a simple matter to store water. Adding 2 drops of Clorox bleach to 1 quart of water will make it last nearly forever if stored in 2 liter pop bottles.
Food is packaged so that with any care at all much can be stored for months.
Almost all people used to keep a supply of food on hand. Going to the store every couple of days is a pretty new development. Our grandparents didn't do it that way. My generation is used to buying groceries every few days and never keeping much of a pantry. We are trying to build up an extra two weeks worth of non perishable food items just in case.