It is the duty of the water slave to transport the water across the desert on Paradise Island. The tiny amount of water, inside a small cast-iron pot dangling from the slave's neck, will be used to quench the thirst of nearly a hundred slaves working at the salt mine. Even though each slave only gets a drop, this small amount of mercy will feel like salvation for the slaves who have worked under the hot sun for more than twelve hours.
That is if the water slave doesn't pass out from the heat of the desert. The path across the desert is nearly 15 miles long.