You can drink the water boiled with medical stone directly.
Maifan stone, the name of Chinese medicine. It is a medium-acidic igneous rock quartz monzonite porphyry. Produced all over the country. It has the effects of detoxifying and dispersing stagnation, removing putrefaction and promoting muscle growth, removing cold and dampness, benefiting the liver and strengthening the stomach, activating blood circulation and removing blood stasis, diuresis and prolonging life. Commonly used for carbuncle, acne, eczema, athlete's foot, prickly heat, chapped fingers, chloasma, toothache, oral ulcers, rheumatic arthralgia, low back pain, chronic hepatitis, gastritis, dysentery, diabetes, neurasthenia, traumatic redness and swelling, high Blood pressure, senile vascular sclerosis, tumors, urinary tract stones.