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Using a rock boiling technique to purify water at our Weekend Wilderness Survival Course.
This is a way to effectively purify water in a survival situation if you did not have a filter system or chemical treatment. The containers are coal-burned bowls made from logs. It is a completely primitive technique that requires no specialized equipment.
The little scrubby made from an evergreen tree branch is used to wipe off ash off of the hot stones. The first bowl of water (not for drinking) is for dunking to get off the remaining ash. Too much ash in water is not good to drink.
The second bowl of water is being boiled. Once the water reaches boiling temperature it is safe to drink. When the water begins to cool we add pine needles to add good flavor and vitamin C.