Flashlight. Flashlights will be helpful in the night to help you see what your doing.
Extra Clothing. Being outside you WILL get dirty. So a extra set of clothing well be helpful.
Water purifier tablets. These tablets well kill viruses and bacteria in water.
MRE's. MRE's are great because they only need water to heat up and they car compact.
A large tarp. A tarp well help because if it starts raining you can have shelter over you in minutes.
First Aid Kit. First Aid Kits are helpful because if you or someone gets hurt they can get infected or they can bleed out.
A knife. A knife can be helpful because you can use it to open stuff or for protection.
Matches. They will be helpful if you need to cook something or if its just cold.
Binoculars. Just in case you need to see something from a distance.
A small mirror. A small mirror can signal a helicopter.