I'm looking for advice. I just started my 3 month old son on Cow and Gate Anti Reflux formula and fast flow teats after the GP told my husband and I that he has Reflux. Am I able to make bottles in advance and store them or do I have to keep making one at a time when he wants it? I do not have the time to be waiting each time making a bottle. And how do I keep the milk from clumping when he's drinking it?