Are you of legal drinking age?
12 oz grapefruit soda or sparkling water
8 oz of fresh-squeezed fruit juice:
1/2 grapefruit
1 lime
1 lemon
1 orange
Splash of grenadine (use pomegranate juice for not-so-sweet alternative)
Combine all ingredients in a punch bowl, pitcher, or large cazuela dish over ice.
Stir, serve, and garish with citrus slices.