Place wine, lemon juice and water in a mixing bowl. Stir in sugar until completely dissolved, about 2 minutes.
Pour into a 1-inch layer in two 9" x 13" baking dishes and place in the freezer. Every 30 minutes, use a fork to stir the mixture and break up any ice chunks.
After approximately 3 hours, the mixture will become slushy and frozen. Scoop into chilled serving glasses.