Cash in small denominations. After an ice storm, or any disaster that can cause a power outage, gas station pumps, store cash registers, and ATMs will not work. Depending on the area of the country, power could be out for days or months. When an ice storm hit Mississippi years ago, 30% affected got power restored 6 months later. Plan on having a lot of cash because that 5 gallon gas container for your generator or car will probably cost $100-$200. A roll of TP in a store might cost you $10. Batteries AAA-D size, if you can find them, will probably sell for $10-$20 a piece. And there will be no such thing as change for your $100 bill, so stock up on smaller notes.