What do people do when they have to make up a bottle for the night? Guidelines say not to make the bottle up in advance (milk tin says only keep formual bottles for 2 hours then chuck...), other guidelines say don't add to cold water as it doesn't kill bacteria (plus ours doesnt dissolve properly) btu if I boil kettle in middle of night to add to forula, it takes about a year to cool down enough, and as I onyl wake up when ds wakes up and is hungry STRAIGHT AWAY (impatient baby!) what on earth do I do?! What do other people do?