tee·to·tal·er or tee·to·tal·ler
One who abstains completely from alcoholic beverages.
This is the best one i could find from dictionary.com
Teetotalism
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Teetotalism is the practice and promotion of complete (or T-total) abstinence from alcoholic beverages. A person who practices (and possibly advocates) teetotalism is called a teetotaler or teetotaller (plural teetotalers or teetotallers.)
People generally choose teetotalism for religious, health, family, and/or social reasons. When at drinking establishments, they either abstain from drinking or consume non-alcoholic beverages such as water, juice, and soft drinks.
In some cases, teetotalism is not a practice by choice. It can be forced by allergy. Such a person may be referred to as someone who has been teetotaled. An allergy to alcohol can develop later in life, even after a person has long consumed alcohol.
Contemporary and colloquial usage has somewhat expanded teetotalism to include strict abstinence from most "recreational" intoxicants (legal and illegal, see controlled substances). Most teetotaller organizations also demand from their members that they do not promote or produce non-alcoholic intoxicants.