Drinking plain water over the years is beneficial; it is clean and hygienic and contains the right amount of minerals that are beneficial to the body. The World Health Organization recommends that an adult needs to consume about 1500ml of water per day. Drinking plain water is one of the most important ways to consume water. Tap water becomes boiled water after boiling. This provides a high-temperature sterilization effect, while the chlorine content of tap water used for sterilization will also be evaporated during the boiling process, and will not be harmful to the human body. Tap water contains trace minerals, the closest to the body’s mineral needs needs, neither too much nor too little. Drinking plain water should be done in small amounts at a time, several times throughout the day, about 200ml each time. This helps the body to absorb water evenly and does not burden the body too much.