The idea is to make a snowball about 18 inches in diameter and then push a curved stick through the centre. This then props up the snowball above the container which is going to be used to collect the water beside the fire. Even something like a plastic polybag bag arranged inside a boot can be used as the container. Additional sticks can be used to prop up the snowball in a tripod fashion if further support is required. The radiant heat from the fire, which would be about 1-2 feet away is enough to slowly melt the surface of the snow ball. The water just drips from the bottom surface of the snow ball.

If the container is made from plastic or leather then a small radiant barrier may be required to stop the container melting from the heat of the fire. This could be constructed from a small wall of sticks. A larger wall reflector made from sticks and aluminium foil can also be built on the opposite side of the fire to improve the efficiency of the fires radiant heat reflected towards the elevated snowball.