Number one on your list should be food and water. You'll want to keep enough bottled H2O to keep people hydrated and clean—that means at least a gallon per person per day. You'll also need non-perishable food such as MREs, canned food (just don't forget a can opener), protein bars, peanut butter, and other shelf-stable items. If anyone requires life-saving medication, keep that on hand as well. Next in importance, your stockpile should include a first-aid kit, flashlight, and radio, along with plenty of backup batteries. After that, items for entertainment, sanitation (think wet wipes, resealable plastic bags, even a sturdy plastic bucket), and phone charging (one or more backup batteries and chargers) can be enormously helpful.