People in China and cultural circles in China all drink boiled water, which is called "boiled without toxicity". The purpose is to remove microorganisms from water and prevent infection. The ancestors didn't know the principle, but they knew the phenomenon very early. There was a theory that drinking cold water caused diseases in Huangdi Neijing, and this theory spread endlessly. However, the title of this book is "Yellow Emperor", which is suspected of fraud. This book was written between the Spring and Autumn Period and the Wei and Jin Dynasties. According to this record, the clear history should be around 2000. Technically speaking, if you have pottery, you can boil water, so you may have been drinking boiled water for tens of thousands of years. The western tradition is not to drink boiled water, but to destroy microorganisms through fermentation. Napoleon asked his troops to drink wine every day instead of drinking raw water in the station to prevent infectious diseases. This military technology may have been applied by the Romans. In this way, the conscious use of alcoholic beverages to prevent diseases has a history of thousands of years. The fermentation process takes place anytime and anywhere, and the history of drinking is much longer than that of drinking boiled water.
"Drinking with boiling water" can be called a habit, and it should be aimed at orientals, especially China people.
In order to get clean water, early humans used two ways: heating and alcohol. Westerners are used to the latter. This is also one reason why westerners are not so sensitive to wine. As for the reason for this habit, perhaps it is that westerners mainly drink rainwater, which needs less cleaning, while China people mainly drink water from rivers and lakes.