Hoping someone else has some experience of this and can advise - we've just taken our DD (8 months) for a trial at nursery, and been informed that they will not accept bottles of formula which have already been made up, and expect us to provide a formula container and a bottle of pre boiled water.
I'm not too sure about this - at the moment we make her bottles up with boiled water, cool them quickly and then put them straight in the fridge. I know this isn't ideal but making every feed fresh just isn't practical for various reasons.
From what I've read I got the impression that the risk from formula powder not being sterile was probably bigger than the risk of milk kept in a fridge developing some sort of bug.
I'm not sure if I'm being a bit PFB here - would it be reasonable to insist that they either use a pre-made and chilled one, or make it fresh with boiling water? I'm just not sure about making it up with lukewarm/cold water!