So I’m kinda new to the whole formula thing. Was breastfeeding up until a week or so ago. So with formula can you premake the bottles and keep them in a cooler like if your out for the day? And then if you have to warm them up place the bottle in a cup of warm water? I’m just trying to figuring out what is best to do when on the go. I have been out a few times and have made bottles but have done it different each time, trying to figure out what’s easiest.