Toilet paper, make sure it's in your car and you can get to it immediately. Also pack a box to take with you of coffee maker,(if you use it), and coffee/tea or whatever, enough silverware for number of people in family, dishes, cups, etc. You will never find your immediate essentials when you first arrive so be sure you take a box with YOU of things you will need, oh and a working flashlight.
Good luck
Kat