I... haven't had the pleasure of meeting others of my kind. [Pleasure is said dryly as if to indicate he didn't like hanging with other vampires either.]
I assure you I'm not like them, ah despite what I may have said about humans being gullible. [They were though, more often than not.]
Blood bags, they are what they sound like. Hospitals take blood from willing humans and store it in a cool place, such as a refrigerator for emergencies. I tend to use them from time to time, when available.