“The highest drink is water, and it is the least of things in the world.”
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Abu Hamid al-Ghazali 37
Persian Muslim theologian, jurist, philosopher, and mystic 1058–1111Related quotes

Majlisi, Bihārul Anwār, vol.78, p. 311.
General

“Whiskey is for drinking. Water is for fighting over.”
It seems likely that the attribution to Twain is apocryphal. It is not listed as authentic on Twainquotes http://twainquotes.com/, and is not listed at all in either R. Ken Ramussen's The Quotable Mark Twain (1998) or David W. Barber's Quotable Twain (2002)
Misattributed

“My books are water; those of the great geniuses is wine. Everybody drinks water.”
Source: Notebook

“Here are your waters and your watering place.
Drink and be whole again beyond confusion.”
Directive (1947)
Context: I have kept hidden in the instep arch
Of an old cedar at the waterside
A broken drinking goblet like the Grail
Under a spell so the wrong ones can't find it,
So can't get saved, as Saint Mark says they mustn't.
(I stole the goblet from the children's playhouse.)
Here are your waters and your watering place.
Drink and be whole again beyond confusion.

“The water out of the tap is very hard to drink”
Tomorrow
Song lyrics, Frogstomp (1995)

Twitter post, https://twitter.com/SenSanders?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor (25 April 2019), quoted in * 2019-04-25 City flags fly at half-staff as mayor tells Flint to 'never forget’ water crisis Ron Fonger MLive https://www.mlive.com/news/flint/2019/04/city-flags-fly-at-half-staff-as-mayor-tells-flint-to-never-forget-water-crisis.html
Ref: en.wikiquote.org - Bernie Sanders / Quotes / 2010s / 2019
2010s, 2019, April 2019