This earns them ponts. Awards are made in tokens. The cost of hiring the Trangia is 10. Scout gives Trading Post 10. When water is successfully boiled the Scout returns the Trangia to the Trading Post and gets his 10 back plus 5 for performing the task.
Leaders can assess the completeness of the challenge and award the points.
Hand out challenge sheets and allow the Patrols 10 minutes to decide upon the order they wish to do the challenges in. Hand out a float of tokens to each Patrol. Allow 1 hour to do the challenges. When the challenges begin the Leaders will need to man the Trading Post. Deal with the Patrols on a first come basis.