This might sound like a stupid question, I'm just not sure what people normally do. If I want to bring a bottled of refrigerated (or frozen thawed in the fridge) milk on an outing do I need to store it in a cooler with ice packs and then warm it up under warm water before feeding or can I just take it out of the fridge and keep it at room temp in the bag until feeding? This is assuming that it would warm up a little bt in the bag before the feeding. I know that fresh milk is good a room temp for a few hours but I'm not sure how that applies after the milk has been refrigerated and then thawed. Thanks!