After burning longan fruit trees to ashes, sift and collect the ashes in a small crock, add mineral water until the water level is 5cm higher than the ash surface, cover and let stand for 3 months, and the filtered water is natural alkaline water. Other hardwoods can also be burned into alkaline water, but avoid trees whose bark will produce gum juice. The ashes of burning weeds after drying can also be made into alkaline water. Straw will do. The alkaline water made will feel slippery when it sticks to the fingertips, and it will feel a little salty when tasted with the tip of the tongue, but the alkaline water made of longan wood ash will have a little sweetness after dilution!

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