Preheat oven to 350 degrees F. Line the bottom of a 9x1 1/2-inch round baking pan with parchment paper, and grease the paper. In a small bowl, stir together brown sugar, the 2 tablespoons melted butter, and the water. Spread in prepared pan. Arrange mango or peach slices over brown sugar mixture. Sprinkle with blueberries.