How to Make Tasty and Healthy Water Using Charcoal
You'd have an initial source of water and food, a means of boiling water in the coffee mug, once emptied the plastic bottle can store the freshly boiled water while you boil more, a cutting tool, a way to make fire, a signal device/back-up fire starter, a cover element, a cotton filter/bandage, cordage/tape, and a container to carry it all.