I've gone with Double A in the past, but I just bought a dozen Cab Franc vines from Ohio Grapevine & Nursery. I have a similar situation to the original poster's. Planting was put on hold due to weather. When I spoke the rep at the nursery, he said that the vines would be fine in a bucket of water for up to a week.
My vines arrived this Monday and I will not be able to plant them until Friday...so they have been in a bucket of water since 5 p.m. Monday. I have changed the water every night, for whatever that's worth. Do you think they will be alright? Should I do something different for the next 24 hours until I can get them into the ground?