I have to drink 3 liter
Not if the room is kept at about 18-22 centigrades and you are moving barely.
but they gave me nothing.
Probably because you are or were still connected to that IV?
An IV adds to your fluid intake also. And more fluid intake requires more walks to the toilet.
With the infusion I have 4 liter at least a day... I think.2 is enough. I am also not a sweaty person.
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