It would really be foolish to travel anyplace without one. Likewise, I believe that the prudent person is prepared in the case of any type of emergency. I don't know where you are writing from, but in some parts of the country violent storms are common, it is a good idea to have food and water supplies on hand in the event of a storm or natural disaster which would hinder one from obtaining needed supplies from a local supermarket. In fact, the National Center for Disaster Relief suggests that every family in America have on hand enough food and water for every member of their family for 30 days. I think this is an excellent idea, and one that is not too costly for most families.
Canned foods are relatively inexpensive, and water is readily available.
There almost certainly will be some inconveniences with the Y2K problem, but I have talked with many state and local officials who have educated me as to the level of preparation in our area. We will not be without water. We will have power. There is nothing wrong Biblically with being prepared. The only passage I have heard used to try to discourage people from preparation is pasted below.