Makes 10 cups
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4 cups pineapple juice
2/3 cup fresh lime juice (about 4 limes)
3/4 cup sugar
1/2 cup tequila (optional)
1 (32-ounce) bottle lime-flavored sparkling water
Stir together first 3 ingredients and, if desired, tequila. Cover and freeze 8 hours. Stir in sparkling water just before serving.
Note: Thaw mixture slightly before adding sparkling water, if omitting tequila.