I've breast fed exclusively for 3 weeks and have now added formula in (for various reasons). Have been using read to use cartons and warming in a mug but we'll be going out to buy powder tomorrow. Now I have no idea about the best way of making up formula bottles. There is so much conflicting advice. What is the easiest and quickest way? Especially for night feeds. If I can avoid going downstairs that'd be great! Apparently you're not meant to make up a few in advance, but it seems that plenty of people do.