I am by no means a hardcore prepper.  But I learned my lesson during the April 2011 tornado outbreak.  We were without power for 9 days.  Since then, I ensure we have plenty of the following on hand:

Non-Perishable Food
Paper Products
Water
Batteries
Gasoline

We are a family of 4 and stock up at Sam's Club.  We havent had to buy toilet paper since COVID-19 happened.  We just grab a pack ever other trip or so.  I get batteries at Harbor Freight whenever I am out using a coupon.  For water we buy the gallons and store it in an extra room.  Gasoline is stored in the shed and I put the date when I fill and use Sta-Bil.