Put 3 or less blueberries, depending on the tray, in 2 cubes. In other 2 cubes, add strawberry slices, then raspberries in other two, and blackberries in other two.
Then add water and put in the freezer.
Put big mint sprigs in the jug together with the ice cubes, and then add mineral water. Perfect for freshening up during hot summer afternoons.