Since the does you are getting are mature animals, I wouldn't be as worried about them dying from stress, but I still wouldn't bother them much for the first week or two especially since they will be bred when you get them. Hard as it is to keep from interacting a lot with new pets, I would just let them stay in their cage(s) and get used to their new surroundings rather than taking them out for playtime. You might want to give them a box to hide in as well.
Make sure to get a couple of pounds of the pellets the breeder feeds so you can transition them slowly to their new diet. Ask the breeder if they are used to having any treats, and if so what kind and how much.
When I take my rabbits to shows I always bring my own water. Some rabbits are picky and don't want to drink water that smells different, and if they do the minerals or chemicals in the new water source may not agree with them. Given your bad experience last time, I would err on the side of caution and get some water from the breeder too. Just bring a few empty soda bottles along to fill up so you can transition them over to your water slowly.
Keep them in a similar environment to what they are used to. If they were outdoors, keep them outside. If they were indoors, keep them inside.
I hope you have a great experience this time, and they settle in quickly and without any problems! :good-luck: