Saving Juice from Canned or Frozen Fruit

Whenever we eat canned fruit or frozen fruit, I save the juice and put it in ice cube trays. Once frozen, I put them in the baggies and put them in the freezer. We then use them for milkshakes by taking a few ice cubes and milk or plain yogurt and mixing them in the blender. My kids love them and it is sweeter than any store bought yogurt.