J.--
Not sure if I can help you with your question, but I did want to address the issue of sterilizing the bottles.
I'm not sure what type of sterilizer you have, I have never used one, but I do know what I learned while I was in medical school. The only way to truely sterilize anything is to use steam under pressure. That means to put something into a dry chamber, fill it with steam until it reaches a certain temperature, and fill the chamber with so many pounds of pressure. Many people are falsely led to believe that simply boiling water or that of a dishwasher is all that is needed to sterilize something. Obviously, hot water cleans better than cold water, but it does only that, it does not sterilize. By boiling something, you are not removing anymore germs and bacteria than you would if you just washed it in your normal hot dish water.