I have been popping on to various threads over the past few months with this suggestion. I feel (as a general prepper) that it's a good place to start . Or do no more than this. But think about it and your personal situation. Tweak as suits you.
Imagine you are snowed in for three days. What will you and your family actually eat? Get freezer friendly and/or shelf stable versions of that. What are your hygiene needs - toothpaste, sanpro, shampoo etc. Make-up too if it makes you feel good.
Think about snacks and treats. And entertainment. Because being stuck indoors is boring.
Why 3 days? It's doable and storable and keeps you away from the shops while you suss out how things are locally. Want to do more? Plenty of advice on MN.