Hi Jill,
Visiting Walt Disney World with an infant can be so much fun. I remember my daughter's first trip to Walt Disney World at seven months old. It was amazing to see the magic through her eyes.
I have a couple of recommendations for you for sterilizing bottles in your room at Disney's Wilderness Lodge. First, I am not sure which room type you have, so I recommend that you call Disney's Wilderness Lodge directly at 407-824-3200 to ask if your room type has a microwave included. If it does not, you can request a microwave for your room. Although a request is not a guarantee, Disney will do their best to honor all requests. Then, you can bring a microwave bottle sterilizer to use in your room. Even if you cannot get a microwave in your room, I believe that there is a microwave at Roaring Fork quick service dining location at Disney's Wilderness Lodge that you can use.
I know that it can be difficult to change your baby's bottles and I do not know what type your infant uses, but many people also recommend using the bottles which use a drop-in liner while at Walt Disney World. This way, you only need to worry about cleaning the tops of the bottles, which you can do at your resort using very hot tap water and a small bottle of dish soap that you bring from home. Although this will not sterilize them, it will be a very thorough cleaning.
Finally, do take advantage of the
Baby Care Centers while you are at Walt Disney World. Although these are in the theme parks, not your resort, they do have amazing facilities for babies. They have kitchens, so perhaps sometime if you baby needs a break, you could ask to boil some water to sterilize bottles while your baby is taking a rest.
I hope that this information is helpful for you, Jill. Have a great time planning your vacation, and please do not hesitate to ask if you have any further questions!