Overnight water is generally drinkable, but it is best to keep it in a clean, sanitary container, and it is best not to drink it if it is an overnight tea or drink. Most of the overnight water is drinkable, but it is recommended to try to drink it on the next day. And if the overnight water is pure water or boiled pure water, the bacteria are basically inactivated, so you can feel safe to drink. In addition, if the overnight water is placed in the container without a lid or limescale, hot environment, it is not recommended to drink overnight, to avoid bacterial growth caused by abdominal pain and other uncomfortable symptoms. At the same time, it should be noted that overnight tea, sugary drinks, etc. is not recommended to drink overnight or after a long period of time, to avoid breeding bacteria, affecting health.