1      medium        pineapple -- peeled
2      medium        limes -- peeled and seeded
1/4  cup           sugar
3      cups          sodium and calorie free sparkling water  chilled
Ice cubes or crushed ice
Extract juice from pineapple 2 cups and limes 1/4 cup, using juice extractor.  Mix juices and sugar; refrigerate until chilled.  Just before serving, stir in sparkling water.  Serve over ice.  Garnish with lime slices if desired.  
6 servings