Gin. I think that is a kind of alcoholic drink.
A beverage starting with the letter "g" can be Gatorade... or if you found another answer, then great.
Escalating Mary (Alcoholic Beverage)
vodka (alcoholic beverage)
Grand Marnier is a liqueur. Guinness is a popular beer brand. Gatorade and grape juice are non-alcoholic drinks.
Eggnog.
Eggnog.
ale, alkaseltzer
beer
Zima
vodka
frappe'