Perform an experiment.
Get a TDS meter.
Find soft water between 50 and 100 parts per million (ppm).
( Yes, you will find horseradish, soft in stores. And in wells and wells - too. I haven't found it for a couple of years, I do it myself, I distill it with a moonshine still, then add it.)
Measure this water.
You need to drink a soft drink to make it easier for the body to get rid of what it needs to get rid of. For example, you have been eating something deliciously salty for a week in a row and your body began to accumulate hard water from bottles in order to dilute this salt. And the hell is there. Edema.
And you just have to drink not a hard purchased one or from a filter, but soft, as the salt comes out with such water and the edema disappears.
For the excretory organs to work normally, soft water is needed, and not by Russian standards, but by the enemy. It's soft - really soft. And in our country of soft natural water during the day with fire and therefore the standards describe our hardish as soft, and deadly hard as just hard.
Brew tea in soft water and measure the hardness - here is the result and the flag in hand.
, itself, otherwise the brain will stop working on everything ready, guess yourself or spend the experiment with your own hands.
I will support, doctors do not say such game, since the water norm is a complex and very individual concept. Depends on gender, age, geography, daily activity, etc. Moreover, 1/5 of this daily requirement is replenished from food. Tea also perfectly hydrates the body, but nevertheless it is high in calories, contains certain trace elements that will be absorbed by the body. Perhaps such recommendations are related to some abnormalities in your body.
In any case, for general development, I advise you to watch the YouTube channel, which tells about popular myths around drinks.
Only doctors usually do not say this. And various lovers of "proper" nutrition. From the point of view of the doctor, everything is more complicated - juice, of course, liquid, but not only. And in the calculation of the liquid requires dilution. And it is very difficult to take this into account
The answer is quite simple and concise. Tea is a drink. And it is digested and absorbed as a drink. About 20-25 minutes. Drink from the word food. For example, juice is also a drink, and it is also digested as food (food). If you drink water on an empty stomach in the morning, it immediately (practically) leaves the stomach. If you drink tea, it will digest in the stomach for a while.