Tristan
Aye, the talismans are actually old island magic. Long and complicated story, that - The short story of it is that I collect very strange paranormal knowledge and artifacts. The blood's a simpler thing. We learned long ago that mixing blood in with alcohol and keeping it at a certain temperature, always moving, ensures that the blood won't go bad, and will be safe for consumption for about a month, give or take. Then again, might not work for all vampires, I've heard of sorts that can't consume anything but blood, so the alcohol might not be very good for certain men's stomachs.
You're free to do it, but he only causes as much trouble as trouble comes to him. He's a bloodthirsty man, but to be perfectly honest with you, I'm not even sure if he'll take to his life of crime again. I only warn you because if people just suddenly start disappearing after making an appointment for a haircut, we'll know why and he's awfully good at keeping himself protected.