we took our baby last December when she was 3 months old, and let me tell you, she was a lot easier than her 6 year old sister!
I was bottle feeding too, and what I did was use the pre-measured sachets of formula, and filled my bottles with water, then I just made the bottles up as and when I needed them - no hassle at all, and no need to warm the bottles (as they weren't refridgerated). We fed anywhere and everywhere, in rides, on a bench, on the Tommorowland Transit Authority etc etc.
We used a baby bjorn and also a sling (similiar to a Maya Wrap), and they were both very useful, depending on teh size of your baby, the baby bjorn might not be too comfy anymore.
We also had a stroller and my dd was quite happily asleep in there most of the time.
the only slight difficulty we had was that our baby couldn't sit in a highchair yet - someplaces have an infant chair, but not many. sometimes we brought the carseat in, and other times the stroller, so we always managed, but it was an issue.
dd is now 6 months and manages our highchair ok, although the WDW ones don't have a back, so I am not sure if a 6 month old would be ok in there or not.
Bev