In this encounter, the heroes are required to bring water to the house and cabin in order to put out fires. The Overlord gets to put fatigue tokens on both buildings each turn, and when four tokens are on a building, the Overlord gets to remove a fire token. If the heroes bring water to a building they get to flip a fire token over. Does this mean that the token is no longer a fire token and cannot be removed by the Overlord?

Second question: Can heroes pass buckets from one hero to another in the same way they can trade items? Basically making a water chain from one hero to the next?

Thanks in advance for any help on figuring this out.