Yeah, I generally use about a tablespoon of ACV/quart of water used (I'm tiny, so I usually only take about a quart and a half). Sometimes I use a little more ACV than that, but not too much more. When I've put in too much I know because I can't hold the water very long at all and it feels too acidic.
I only started doing enemas about a month ago, and I only do enemas twice a week or less. Most of my enemas have ACV in them in the theory that the colon is supposed to be slightly acidic and that candida can't thrive in an acidic environment. I also use a teaspoon of Sea Salt /quart of water. I'm very cautious because I don't want to become dependent on enemas and am totally worried about giving myself a bacterial infection. I'm obssesive about cleaning and drying everything.
Also, I follow every ACV enema with a probiotic 'retention' enema of just a little liquid and lots of capsules of probiotics on the theory that "ACID"-dophilus (meaning acid-loving) likes more acidic environs. Hope that helps. Be careful everyone!