These are the grocery items you should have in stock before a winter storm

(CNN) A powerful winter storm is threatening parts of the eastern United States with crippling freezing rain, sleet and snow, as experts urge Americans to be prepared.
Here's what you should make sure to stock up on in your home.
High-protein and non-perishable foodsThose include foods like energy bars and protein and fruit bars that don't need to be refrigerated or frozen, Sands said.
Dry cereal, granola, peanut butter, dried fruit and non-perishable pasteurized milk are also good to have as you hunker down.
Comfort foodThough not essential, experts recommend you have comfort and stress foods on hand as you weather the storm.
WaterStore at least three days' worth of water supply for each person in your household and for each pet, the CDC recommends.
Unopened, commercially bottled water is the safest and most reliable water supply, the agency says.
Be sure to also have several days' worth of supplies for pets, like medications and non-perishable foods.
Hygiene productsCheck that you have the hygiene products you need -- including feminine supplies, toilet paper, wet wipes, paper towels and hand sanitizer.
"How are you going to be able to store this food if you don't have power?"
Fill up your gas tankWhile in a winter storm you should try to minimize traveling as much as you can, to avoid getting stranded on the road.
Create a family communications plan on how you'll be able to get in touch if you are separated during the storm.