Sorry, I have googled but not having much luck. DD is BF but had hoped to give her a bottle tomorrow as we're out for the day travelling by public transport for a lonh journey and finding a place to stop and feed may be tricky. She happily takes a bottle of formula but only when warm. Tried her with a carton of formula at room temp today but she refused it. Would it be safe to make up formula with slightly cooled boiled water as advised then transport it while it cools to feed 1-2 hours later?