You can fix and forget this nutritious dessert. Make up the fruit mixture, then freeze until you're ready to serve.
In a medium saucepan combine 3 cups water and the sugar; bring to boiling, stirring occasionally to dissolve sugar. Boil, uncovered, 1 minute. Transfer to a very large bowl. Stir in remaining ingredients.
Divide between two 2-quart freezer containers. Cover and freeze till firm, stirring occasionally to distribute fruit. Store in freezer up to 1 month.
To serve, let stand at room temperature about 1 hour. Scrape mixture into dessert dishes. Makes 20 servings.