How do I use ready-made formula milk?

You can buy ready-made formula milk in cartons. These are more expensive than powder formula, but they can save time and are convenient when you're out and about.

All you need to do is pour as much as you need into a sterilised bottle, and warm it up. Or you could just give it to your baby at room temperature if she likes it like this. When you open the packet, make sure that your hands are clean and you use clean scissors, if you need to.

If there's any ready-made formula left in the carton, use it within 24 hours. Make sure the cut corner is folded down and store the carton in the main part of the fridge where it’s coldest. The temperature of the fridge should be five degrees C or less.

Source from: http://www.babycentre.co.uk/a555284/making-up-a-bottle#ixzz3Ul5pSMnF