Water. Speaking from the Hurricane Prone Gulf of Mexico, get more water than you think you need. Not just drinking, but be sure you can flush a toilet if the power is left down in your area.
A good sealing bathtub should be full of water when it really gets close.
Some little items like that can cost little but make a couple days without power soooo much better.
Any plastic milk jugs or the like should fill your freezer with water. Lots of ice to ride through power outages without getting too warm.
Yep got all my water yesterday, 2 5 gallon jugs and some bottled water too. We are on water catchment here so have a 24 foot above ground pool full. We have about 16,000 gallons on hand. I guess that’ll do :)