Cantaritos

Stir 3 ounces lime juice, 2 ounces grapefruit juice, 2 ounces orange juice, 2 ounces silver tequila, and 1/4 teaspoon coarse sea salt together in a liquid measuring cup or cocktail shaker until the salt is mostly dissolved.

Fill 2 cantaritos or Collins glasses halfway with ice. Divide the cocktail between the glasses. Top each glass with 2 ounces chilled Squirt soda. Garnish with a sprinkle of salt and lime and orange slices if desired.

For a larger batch (6 servings), stir 9 ounces lime juice, 6 ounces grapefruit juice, 6 ounces orange juice, 6 ounces silver tequila, and 1 1/2 teaspoons coarse sea salt together in a medium pitcher until the salt is mostly dissolved. Fill halfway with ice, then top with 12 ounces Squirt. Garnish with more salt, lime, and orange slices if desired. Pour into ice-filled glasses.