Include:
- Flashlight with batteries
- A change of clothes. Generally, include a pair of long pants and a long sleeved shirt. If you have an old jacket, include it. Don't forget the underwear, socks, and a hat.
- List of emergency contact info/photocopies of important documents.* At the very least, important phone numbers and ID.
- Some bottled water and/or means to filter water. (16 oz in your pack is better than nothing in your kit, right?**)
- Snacks, high-calorie and non-perishable
- Water - 72 hours worth is 3 gallons/person. You didn't think you were going to have to carry all of that in your backpack did you?**
- Radio
- Other emergency lighting
- Basic first aid supplies
Do yourself a favor; do this much, just this much.