My daughter is almost a year old and I cannot WAIT to ditch the perfect prep machine and start giving her cow's milk instead. 
She currently has one bottle before bed and one before her afternoon nap. If I'm out of the house all day I use premade formula (she takes it at room temperature). My question is... what should I do once I am using cow's milk? Surely I can't have a bottle of that sitting at room temperature for several hours?!
I'm sure there is a really obvious answer to this which I haven't thought of