Potable water is the most critical thing you can be taking care of. 1 gallon per person per day is the baseline. Fill every large cooking pot, your coolers, your washing machine, your bathtub, and anything else that can hold water (such as Rubbermain storage containers) before the storm arrives.
If you have extra capacity for non-potable water (such as your trash cans), fill it to be able to manually flush toilets.
You can live without food for a couple weeks, but it won't be fun. You should be eating your perishable foods up and buying non-perishable foods.
Fill used soda bottles with water now and freeze them. They will give your freezer food a couple of days of life.
Hit the ATM now for a few hundred bucks of cash.
Make sure you have a fresh supply of any critical prescriptions.
Fill up your cars with gas.
Get batteries and battery-powered LED lights. Look at buying a cheap LED headlamp - VERY useful in a prolonged power outage.
Look at having backup cooking such as a campstove. If you have a gas grill, have an extra propane bottle.
Hit the library for books and stores for cards and games to keep you entertained.
If you smoke and/or drink, have enough on hand for two weeks.
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.