Last April we were traveling with our six month old infant. The best advice that I received on here was to have the formula shipped directly from enfamil to the front desk of our hotel. There were 48 individual bottles that did not need to be heated or refridgerated. I could stick them in my backpack to take to the parks and we were set for the day. We did not need a fridge in our room. I used 45 bottles during our 6 days at the parks and had 3 bottles left for the morning 7th day plane ride home. It worked out perfectly and I did not have to worry about bringing them in my suitcase. I hope that this tip can help somebody else. We will be returning this April with our daughter who will then be 18 months, a whole different experience.