If the water has been left for a long time, if there are no abnormalities in color or odor, you can generally drink it. However, if water deterioration occurs, it is usually undrinkable.
If the water is placed transiently and there is no change in the quality of the water, the color and smell of its water are normal, usually can drink.
However, if the water has been placed for too long, the water may be infected by bacteria, resulting in cloudy water color, smell abnormal, the possibility of its water deterioration, it is usually not recommended to drink, you should discard the water in a timely manner, so as to avoid accidental ingestion.
In daily life, you should eat fresh food, you can eat more fruits and vegetables, eat less greasy, spicy stimulating food. If you feel unwell after drinking spoiled water, you should seek medical attention.