I agree on the formula aspect. So far, I've gathered two packages of 2oz. plastic bottles of Similac and some nipples and rings to fit. That makes a total of 16 2oz. bottles, or 32oz in total. The big problem with these is the expiration dates. The two packages I have are dated Jan 2006 and Mar 2006. Those were the latest I could find. Some of the larger sizes are dated later (I've seen May 2006 on the 4oz glass bottles). Those should suffice for emergencies. We are breast-feeding, but you never know what might happen. For longer periods, I'll include some powder.