I posted this on another thread but when we were evacuated for the fires here in So Ca - I went ahead of time and bought a bunch of dry ice to put in the freezer to extend the life of the food. Right before we left I stuck some in the fridge section too. It save the food for 4 days of evacuation and no power. I also had some in an ice chest for what we took with us and it lasten nearly a week.
Good luck and be safe