Just don't take so much Miracle-Mineral-Supplement that it makes you sick. At the first signs of nausea or any other discomfort cut back. If a few drops does the job and you are steadily improving, why increase to 15 drops?
citric acid will give you the strongest activation but it tastes more bitter to me so I used Lemon or Lyme drops when I was taking the MMS. Organic grape juice works very well for masking the taste. The chlorine dioxide will be stronger if just in water though.