[gillwrayhk]

Graham
Coming from a medical background, I understand that it is not advised to pre-mix any feeds but to mix the formula and water only when you need it. That way there is no time for any bacteria to start to form in the mix. You can always transport your sterilised bottles of boiled water in a cool bag ( There are ones just the size for two bottles). I have never had any of them leak before
Good luck!