I haven't added it to the Master-Cleanse lemonade per se but I have had it as a separate beverage. I like Bragg's Organic ACV...i just tastes like its good for you...strong robust stuff.
ACV is a miracle.
There may be some hard core MC'ers who say only stick to the lemonade and the herbal tea...reminiscent of orthodox religion...anywho, ACV cleans you out and is supergood for you. I say drink up!