How to use electric kettle to boil water is healthier?

Don't use tap water directly, but use the water filtered by the water purifier and put it into the electric kettle. Once boiled, pour it into other containers at one time, don't burn it again, and reuse it. Because many bacteria in the water are killed after it is boiled, it is more nutritious. If boiled water is repeatedly used, the nutrition in the water will be gone. I hope I can help you, thank you!