Ok Orientierungswert von 6 NaCl g/Tag. Which is 2.3g Na. Back to the beginning: trying to get that from water alone, ni matter how good publicity Eaainger hat, will kill you.

BTW the elefant in the room: getting some less than 2.3 g/day will kill a healthy person relatively quick, while a diet with well above 5g/day will be shedded by healthy individuals without any problem…

"Back to the beginning: trying to get that from water alone, ni matter how good publicity Eaainger hat, will kill you."

Depends on the water. All the water sold or the one from the tap is artifically reduced in Na.

A natural spring might not be and has high values. Or a well in the desert (they can be very salty).