During the ice storm caused power outage back in 2009 stores here were pretty well stocked with everything and the same for gas stations but the problem was for the first week or so they couldn't process debit/credit transactions or run gas pumps without power. Some in outlying areas were without power for as long as a month. Many, many people were just S-O-L and cash was king.
I can't imagine not having a little cash comfort cushion around. I can't tell how many times I've been able to go to the front of the line in a store "when the systems are down" and just pay with cash and go. Especially when traveling overnight.
Water, food, water filters, bug out bag, cash, hand warmers, etc..... basic emergency supplies.
