We did this in August when we stayed at ASMo. To make a long story short, Disney lost my case of water. My advice to you would be to bring the UPS tracking number with you, so if it is lost, at least they might be able to figure out where it is by who signed for it.
I'm not going to go into much detail because I was flamed when I posted my situation on the Disboards after I got home, but Disney did good by me.
Hopefully yours won't get lost!!!
Shannon