EMPTY drink mix into large pitcher. Add water; stir until drink mix is completely dissolved. Stir in pineapple juice and grenadine syrup. Refrigerate several hours or until chilled.
MEANWHILE, insert pineapple chunks evenly onto skewers; cover and refrigerate until ready to use.
SERVE in 8 tall glasses over crushed ice, if desired. Add 1 pineapple skewer to each glass.