It is possible. Secondary boiled water can be consumed and the substances in it are not harmful to the body. However, if secondary boiled water is not stored properly and is left out for too long, there is an increased risk of contamination by dust etc. Drink the secondary boiled water as soon as possible. There are experimental surface even if it is a number of boiling and placed for 48 hours “overnight water”, its nitrite content is only 0.036mg / L, from the drinking water nitrite ≤ 1mg / L of the national standard there is a long way to go. The second boiling water contains only trace nitrite content, in the safe drinking range. It is recommended to try to do the same day to boil the same day to drink, if the day of boiling water is not finished, should pay special attention to the storage environment and the way, such as the lid cover, to avoid foreign objects fall into the water, to prevent contamination.