Blankets: Regular blankets are good. “Space blankets” are also an option. Blankets can be used to cover windows, keep you warm, build shelter, carry things, etc.
Sleeping bag: To keep you warm and to sleep in/on.
Tarps/plastic sheets: for covering broken windows and for building shelter.
Duct tape and trash bags: Can be used as an alternative to the above items plus they are more portable and more versatile. (Trash bags can be shelter, rain poncho, etc. Duct tape fixes all.)
Small tool kit or multi-tool: Knife, can opener, screwdriver, pliers, all in one.
Candles: For both light and warmth (make sure you include matches or a lighter).
Local maps: Don’t depend on your phone (it may be dead or near dead). Mark your meeting places on the map in advance so you don’t have to remember them.
Extra cash: Small bills are good.
Personal documents: IU ID, driver’s license, Social Security card, credit cards, health insurance card, etc.
Contact information: Phone numbers (home, mobile, work) for family and friends (again, don’t depend on your phone).
Backpack(s): To carry all this stuff in case you can’t stay where you are. A spare (empty) backpack to carry additional supplies or water.
POSTIVE MENTAL ATTITUDE: the single most important survival item. It will get you further than anything else. Pack what you need to make it happen (picture of family, deck of cards, pack of gum, special book, etc.)
Don’t forget that you may need additional things if you have kids, pets, or special medical needs.