The first time: I just got up in the morning. At this time, it is a state of blood deficiency.
The second time: around 8: 00 am 8:00- 10/0, it can replenish the water lost during working hours.
The third time: around 3 pm, it is time for tea.
The fourth time: before going to bed, the blood concentration will increase when sleeping. If you drink enough water before going to bed, it will dilute the backlog and dilate blood vessels, which is good for your health.