With an added kick of flavor from the grapefruit juice, this refreshing take on the margarita is excellent for daytime sipping all summer long. For a bit more sweetness (and a bright color), try ruby-red grapefruit juice.
Mix all liquid ingredients in a large pitcher and chill in refrigerator for at least 2 hours. Taste for flavor, adding more tequila if needed.
Rim your glasses by dampening them with a lime wedge then dipping them in finely ground pink salt. Serve each margarita over ice with a wedge of lime.