I have used bottles of fake blood in the past and it was fine however several stops so far this year and couldn't find "gallons" of blood. I was hoping to avoid buying a bunch of smaller bottles and just make my own if it was easy enough.Nice fountains! I've had the one in the middle (the torso) for probably 8 years and never used it because I was afraid to clog it... I'm just going to dump a bottle of fake blood in it this year. If it clogs, then I'll unclog it and deal with it later but at least I'll get some use out of it.
Have you tried just fake blood? What happens?