That's lousy advice to give people, and defeatist. People by the hundreds of thousands are preparing as I type, in South Carolina, Georgia, Florida, and elsewhere. Are stores out of things, or is fuel sold out in some areas? Yes, of course, but that does not mean that everything is gone and there is no hope for individuals and families to prepare. Most people even have many of these items on hand already, they simply need to sort them into a kit and get ready.
Tap water works for all water needs, and a 5 gallon water dispenser bottle gets most people out a day or two.
But skipping the beer in favor of water - sometimes at a higher cost?
Talk about buying for speculation!