Common sense of vacuum flask

Can you drink water from a thermos overnight?

If it is boiled water overnight, and the vacuum flask is covered with a lid, it is in a sealed state, then it can be drunk normally. Because the boiling water obtained after boiling the water is sterilized, the water that is placed in the thermos for one night is the same as pouring a glass of water in the morning in the afternoon, and the ingredients have not changed, so it is drinkable.

However, if the water in the thermos cup is not boiling water, or the thermos cup is open overnight, not airtight, and in contact with the air, some mosquitoes may fly into it to lay eggs, which is not recommended. If you leave it overnight, you can observe the bottom of the cup to see if there are small particles. If there is something similar, it is best not to drink it. However, if you are thirsty without other impurities, you can drink it. Of course, it is best to re-boil the water to drink, so as not to make your body uncomfortable because of this little water.