Why is it not good to drink water that has sat in the glass during the night?

We've been taught that it's good in the morning to drink common water, which has been sitting in the glass at night, not drinking water directly from the tap. But did you notice that living water tastes strange? Does it mean that the water may have broken or that it is the word [...]
Does it mean that the water may have broken, or is it something else?
Common water, in contrast with food, contains no sugar or albumin for which it is easier to pollute with germs.
For the strange taste of water, which has been in the glass at night, there is an explanation.
In fact, since the water has been exposed to the air, it's absorbed a little carbon dioxide and part of CO2 has been converted into carbon dryer, which means that water in the air changes its chemical composition.
When carbon dryer releases one or two protons, and turns into bicarbons or carbons, then lowers the water Ph for what reason water changes taste.
Is it worth letting water stay overnight in the glass, and it's not easy to understand even when you remind them that the water has been exposed to bacteria, and then it has completed an unusual amount of dust.
This does not mean that water has broken down, but because of all this that has been stored in it at night, we should think twice about drinking or not.












