Depending on age, each family member should make a list of the special items that he or she needs included in the kit. Everyone grade school and older should learn to use some of the essential equipment, such as the fire extinguisher. Collet those items that you already have on hand. Make a list of other essential items and develop a plan for getting those items. Many items can be found at discount stores, camping and sporting or ordered from specialty camping or emergency supply catalogs.
Some items are definite musts.
These include a first aid kit and fire extinguisher. Water needs to sit for 30 minutes before drinking. Canned goods have long shelf lives. So do family members on special diets and those with allergies. Rotate your stored foods into your regular food supply to keep your supply of food fresh.