We didn't use bottles, but there is an Avent steam sterilizer in the baby care center in AK that you can use to steam sterilize your bottles/nipples. We used it for our pacifiers when I stopped there to nurse/change my daughter since we figured they had gotten quite dirty during the trip despite trying to keep them clean.
Also, Medela makes sterlizing bags that work in the microwave and I'm pretty sure all the baby care centers have a microwave that you can use. It's just a plastic Ziploc type of bag that you put the supplies in (not sure if bottles would fit, we used the Playtex disposable nursers so we just used the bag for nipples and breastpump parts) and add some water then microwave for a few minutes.