If you have a extra Frig go ahead and fill the Freezer with ice.
If you have a Freezer, fill up and extra space with 2 ltrs of water or I use empty ice cream tubs so they have a chance to freeze and will help keep your freezer cold if the power goes off.
Extra diapers for babies.
Check your meds and make sure you have enough to last you a couple weeks or better.
Don’t buy food that needs refrigeration. If you have kids buy powder milk or hot chocolate mix made milk.
If you don’t have or need a chain saw think about buying a axe and or a bow saw. You won’t be able to cut up downed trees, but you can clear away branches and small limbs for those who do have chain saws. and DONOT forget some good leather gloves.
It’s not going to get blizzard cold, but for those with small children and older folk you might thing about getting some alternate heat source like a kerosene heater or a small Portable Propane Heater.