Vacation with a 2 month old baby

Sydney
Okay guys I'm a first time mommy, but I am married with a 5 year step son. We have planned to take him to Disney World in July. So I need some major advice!!! My baby girl will be around 2 months at this time, I will be breast feeding her (God willing). We are taking my grand parents to help us out because it is an 8 day trip. We will be driving NOT flying so I won't have to worry about all that. And she will be spending very little time outside of our resort suit. What all do you guys suggest I bring for her? I am trying to add travel stuff to my registry ahead of time since I know I'll need it but I don't currently have anything. She will not be a co-sleeping baby. So I also need some advice on what all I should bring for her to sleep in.