I did nine days once, in the Maine ice storm.
Hauled water out of the well with a bucket, used the wood cook stove for heat and cooking. Scooped chipped ice up off the deck with a shovel and put it in coolers. Had plenty of food on hand, both in the pantry and freezer.
Used an inverter from my car. Now I have a generator.
Don’t stand there with the freezer door open. Drag out all your camping gear. Keep some full propane bottles for your Coleman stove.
Our electricity was off for 10 days after hurricane Ike, and we are right in the middle of Houston. We are on a small loop of 16 houses and they made repairs that affected more people first. You realize how spoiled you are when something like that happens.