We don't have any synonyms for water drinker yet.
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Definition of water drinker:
(n) :
Someone who drinks water, especially in preference to alcoholic drinks; a teetotaler.
(n) :
(now historical) Someone who drinks the waters at a spa.
(n) :
(Christianity, obsolete) A member of an early Christian sect which drank water instead of wine during the Eucharist.