The kit should contain the absolute minimum amount of gear you wouldn't want to be without. Many items can have more than one use. Seal the kit in a waterproof container. If you have prepared well, you won't have to open it. Learn how to make use of the survival gear.
Nothing can substitute for hands-on experience.
Keep a positive attitude and a will to survive. Not so easy when you are out there with darkness approaching. This is perhaps the hardest survival skill to master. Your mind may give you reasons to keep moving, even though your survival training tells you to stay put. Your fears and worries may suggest panic.