Everything that is bad for health in general will only make your problems worse, including parasite infestation, because parasites thrive in a toxic body, and everything that makes it weaker will aggravate your existing problem. Although alcohol is bad, especially for the liver, I don't think somethink like vodka would directly feed them, maybe rather the opposite. Once, I got really drunk, I'm talking maybe 4-5 cocktails and several wine glasses, while suffering from parasites, candida, and quite poor health in general. The next day I was back to the same I was before the drinking. I wouldn't recommend it at all for the really sick people, but if you feel relatively well, two glasses of red wine once in a while shouldn't be too much of a problem.