The Ten Essentials:
1. Map of the area.
Used with knowhow, a compass makes that topographical map ten times as effective.
You may have to hike (or change that tire) on a moonless night. For your protection:
At high altitude, the sun's radiation is more intense and your eyes can burn more easily. You won,t know it's happening until the damage has already been done.
5. Extra Food & Water.
This is in ADDITION to the amounts you intend on using. Plan on half again as much water as you think you will need on the outing.
6. Extra clothing.
It gets cold out there at night. May include rain gear, wool shirt or sweater, head protection, mittens, extra socks, Mylar space blanket. For emergencies:
7. Emergency Fuel.
Candles, fuel tabs or other long-burning fire starter is essential when trying to start a fire with damp kindling.
8. Waterproof Matches/windproof lighter.
To start the Firestarter. Keep them in a waterproof match holder.
This is an essential tool! The Swiss Army knife is most popular.
10. Personal First Aid Kit.