The Number one thing you need to survive is water. Water is most important thing your body needs. Your body will last longer on water then food.
The next thing that you need to have is food you body runs like a car you need foil to keep it running. In a Case of an emergency you should pack caned food to have something to eat.
After water and food you need a small medical kit In this kit you should have basic medical equipment. This equipment can help you survive when you are hurt in a emergency.
Next in the list of items need in the kit you will need batteries you wont know until you wont know when you might find them useful in an emergency.
You will need a flashlight in case of a huge power out. A flash light will help you see at night.
You should also have a map. A map will help you see geological features of the area you are in this will help you see where your location is at. Also it might help you see where you plan on moving to.
The next important thing you need is weapons. You weapon can very from a stick to a gun. It does not really matter as long as you can defend yourself.
What you should also have is protective gear so you can keep your body protected in the emergency.
You should also pack cloths so you can have something to wear throughout the emergency.
The final thing you should have is toilet paper. Your going to need to clean your poor and pee during an emergency