Citrus Slush

7 cups boiling water
1 cup sugar
1 small can lime concentrate
2 small cans lemonade concentrate
1 small can orange juice concentrate
5 cups strong tea

Mix all ingredients in large bowl. Put bowl in freezer. Freeze for 24 hours. Fill glass 3/4 full of mix and 1/4 with 7-Up. Provide a stir stick and enjoy!