Water- you should stock one gallon of water per person per day, for at least three days. So, for example, if two people live in your home, you should stock up on at least six gallons of water.
Food - similarly, you should stock three days’ worth of food for everyone in your household.
Radio - a battery-powered or hand-crank powered radio will allow you to get important weather and news updates even if the power goes out.
Flashlights - these will provide light in the event the power goes out.
Batteries - to power the radio and/or flashlights.
First aid kit - having a well-stocked first aid kit on hand will allow you to treat mild injuries at home, instead of needing to head out during the storm.
Tool kit - in case small repairs need to be made, or you need to shut off a water supply, it is good to have basic tools on hand.