• 1 cantaloupe , halved and seeded
• 1 honeydew , halved and seeded
• 1 seedless watermelon , halved
• 1 1/2 cups vodka , plus more to taste

Using a melon baller, ball the flesh of the cantaloupe, the honeydew and half the watermelon. Place in a large bowl; add vodka. Cover and refrigerate at least 2 hours, or up to 3 days.

The day of serving, cut flesh out of remaining half of the watermelon. Puree in a food processor fitted with a knife blade. Strain pulp through a medium-mesh strainer set over a large bowl; discard solids. (Alternatively, cut watermelon into 1-inch pieces and place in a large bowl. Mash melon with a fork, then strain.)

Remove balls from the refrigerator; strain unabsorbed vodka into the fresh watermelon juice. String 3 to 4 of the drained balls onto each of 4 cocktail picks. Divide remaining balls among 4 chilled highball glasses. Top with watermelon juice, adding more vodka if desired. Garnish with the cocktail picks.