Botetourt Wineries

I hope to organize a tour of Botetourt County wineries for local residents. I know of Fincastle Winery and 2 others, does anyone know exactly how many wineries are located in Botetourt County? I could use a little help in organizing the tour. I would like to provide a chauffured limo or bus for a very small fee to each person or couple. Also does anyone know of any legal liabilities I may face, a disclaimed or waiver I may need to get signed? Any help is greatly appreciated!