mocktail, n. — Green’s Dictionary of Slang

mocktail n.

[SE mock + (cock)tail]

(US) a non-alcoholic drink.

1984		N.Y. Times 18 Jan. B2: They traded recipes for ‘mocktails’ — drinks with no alcohol [HDAS].
2002		Amesbury News 26 Dec. at Townonline.com 🌐 Just say no to alcohol if you know you will be driving. Order a festive MADD-approved non-alcoholic ‘mocktail’.