I would sneak in a small signal mirror and some small cordage. I have obtained a replacement cap for a Nalgene that incorporates a compass - cheap, but mine still works.Fold and wrap a map around the exterior in between the cup and the Nalgene -perhaps you could wiggle it into the interior as an alternative...I would put in a Tanka bar, not just jerky...

Bread crumbs for marking the trail?