Yeah, not true
Definition of vodka
: an alcoholic spirit of Russian origin made by distillation of rye, wheat, or potatoes. - Oxford
: a colorless liquor of neutral spirits distilled from a mash (as of rye or wheat) - Mirriam-Webster
: an alcoholic drink originating in Russia, made from grain, potatoes, etc, usually consisting only of rectified spirit and water. - Dictionary.com
And just to add: Tito's tastes like dishwater.