Right... I have called several food suppliers helplines...
The guidelines ALL of the companies have given me are as follows:
Boil the kettle.
Leave the water in the kettle to stand, for no more than 30 minutes.
The water temperature MUST be over 70degC when the powder is added.
This is because (i) the powder doesn't dissolve in cold water easily and (ii) cartons of powder open for more than 1 month can contain a bacteria which is killed off at tempertures higher than 70degC
The bottle should then be cooled in cold water and given immeadiately. The bottles made from powder should not be stored at all.
Cartons of RFU (250mls and 500mls) can be stored in the original container for 24hours once opened and for 1L, it is 48 hours once opened.
So, all we have to do is have a word with our babies and get them to place their order around 40 minutes of them actually knowing they are hungry and we'll be fine. Alternatively, we can have a little game of who has a nervous breakdown first trying to sooth a hungry baby while boiling the kettle, making the bottle and cooling the bottle!!!
Something tells me I'll be going back to the RFU stuff!!!
I'm still not convinced about the 70degC thing killing bacteria, but I have phoned 3 helplines and they all said the same thing, apparently it's guidance from the Dept. of Health.
SO there you go.... I have no idea when the guidelines changed, but it must have been recently, because I was told you could store made up bottles for 24 hours if refrigerated when I had DS.
NSSA