Depends on the art, but if that wasn't important and you wanted it to last, I would pre-stretch the vinyl. Then after you roll it around the bottle, heat it up and it will shrink around the neck. For math's sake, you could take a 10" piece of vinyl and stretch it to 13" = 30% up to 50% = 15".
Even with that method this won't be easy. You will have lots of waste and trial and error. Lining up images and avoiding some distortion will be a real pain so charge accordingly. I would think about charging double or triple what you think it's worth.