In some grocery stores they sell double strength squash juice. This means that instead of diluting them with 3 parts water you dilute them with 6 or 7 parts. This means you can get about 10 liters of juice from a 1.5 liter bottle of water. The bottle usually costs around £1 so you are actually buying 10 liters for £1. I have also learnt that you can mix two different squash bottles together and make a fruit cocktail drink. The other thing you can do is mix sparking bottled water to make your own fizzy drink.
What I would do is get the one liter jug and pour 150 ml of the concentrated juice into it and leave it in the fridge. No matter how big your family is, 10 liters of orange juice for £1 goes a long way. I particularly like the lime flavoured one. It is very nice.
I think it is also ok to put plastic bottles in the freezer. You can take them out the night before and they are still quite cold. The bottles can stretch slightly without shattering.
