Once you have your shelter installed you should make sure everyone in your family knows about it as well as registering the GPS coordinates with your local law enforcement agency. Also, there are supplies you will want to have stored in the shelter, ready when and if it is ever needed.
Non-perishable food or candy
Portable lights - LED flashlight or lanterns
Battery powered radio w/extra batteries
Portable stools, if seating is not provided along the walls
First aid kit
Trash bags (large and small)
While we all hope we never need to use a shelter, having it supplied will make the stay more comfortable if basic needs are addressed. PS - Don't forget the cell phone on your way down.