I’d just use boiled water if you’re popping in fridge as the perfect prep only does a hot shot then cold water instead. Have definitely made up bottles and used within 24 hours using boiled water. It’s not the guidance, but I’ve definitely had friends fill up bottles with boiled water and then just put the formula powder in cold.
@Shelby thank you! So it’s a no for making one with perfect prep and putting in the fridge for up to 24? If baby takes cold milk can I put the refrigerated boiled water in a bottle and give it straight like that?