In fact, many mineral water manufacturers use medical stone to make artificial mineral water, and alkaline water is actually mineral water containing more positive ions such as calcium, magnesium and potassium.
Medical stone itself is also a kind of filter material, which can play the role of filtration and sterilization. A good feature of this kind of stone is that too little mineral will precipitate and too much will be absorbed.
I have done experiments, soaked all night, and turned yellow and green with PH test paper, which was weakly alkaline. Medical stone contains many trace elements beneficial to human body, so it is called longevity stone.
You can buy a cup made of stone or medical stone, which is very convenient.