I have tried so many different ways of making formula in a bid to have less distress from the time LO wakes up to the time it takes me to boil a kettle, count up scoops, mix it up, then cool it down again. Even if I'm speedy he can go from half asleep to absolute floods of real tears in the time it takes so I've settled on half filling bottles with cooled kettle water in the fridge then only topping up with newly boiled water (still have to wait for kettle to boil though!) but doesn't take as long to cool.
I read on the box you must never put it in the fridge but then everyone of the older generation said they used to make them all at once so I did it (for a few days) until I caught a whiff of the milk once and it smelt horrendous, it smelt like when our milk has gone sour, really nasty which got me wondering if they've changed the recipe or something since we were little and there really is a reason not to make it up early. I was reading yesterday that bacteria has time to grow if you make it up and then refrigerate it (although I figured fridges stopped that?!) Anyway if you can think of a better way let me know because my way is still not quick enough lol.