Beijing's winter is cold and dry this year. During the Spring Festival, I can't stand going out to drink cold bottled water. So I imitated those foreign stars and bought myself a stainless steel fashion thermos cup to replenish water at any time.
Because when I was a child, it was easy to cool with glass insulating cup water, so when I first used it, I poured the fresh boiled water directly into the pot. I thought I could drink it in 2 hours. As a result, the temperature basically remained unchanged and my mouth was scalded slightly. So I lamented the superiority of vacuum insulating technology and tried to change it. Method: Boil the water, cool it to 30 - 35 degrees Celsius, then pour it into a cup to drink slowly. This is the most healthy way to drink water.
I also did a test. After 8 hours, the cup was filled with warm water at 35 C, which could still be maintained at about 30 C. Normally, hot coffee and health tea at work would not deteriorate and stale. Searching the Internet, it is said that this is also the most popular healthy lifestyle for Japanese white-collar women nowadays.