1 cup white cranberry juice
1/3 (10 ounce) package frozen strawberries
1 slice watermelon, seeded and cut into small pieces
2 tablespoons cosmopolitan drink mix (such as Smirnoff® Cocktails)
4 ice cubes, or as desired
Combine white cranberry juice, strawberries, watermelon, and cosmopolitan drink mix in a blender; pulse until well blended. Add ice and blend until desired consistency is reached; pour into a martini glass.