Looking for some advice on sterilising bottles. We’ve got an all day wedding coming up and I’m trying to work out how’s best to take dd bottles with us. We’ve got some pre made bottles of milk so we don’t have to mess with boiling water. Our steriliser says the bottles stay sterile if unopened for 24 hours but it doesn’t say anything about how long they are ok to use after you’ve opened the steriliser. Would the bottles be ok to use throughout the day if they have lids over the teats? It’s a minefield trying to ensure everything’s done properly