This is a lot to answer. First see the page on enemas which is a quick, easy and thorough bowel cleansing you can do right before you do your master cleanse fast. Once is all you need since you will not be consuming any food with your lemonade. Then you can forget about colon cleanses. Click on page about Master Cleanse. Fasting has powerful colon cleanse effect that you you see when you stop fasting.
Then click on page about "pure water" to see about what water to use. If after your Master Cleanse (don't know if you are going to do it for 3 days or 3 weeks) you may still want to do a colon cleansing. It does not work as good as a long fast but is a lot easier since you can still eat.
On enema page it tells about a great colon cleanse and why. Click on that and there is a liver/kidney cleanse that you can start on a few days after starting colon cleanse. Then you are doing a deep cleansing of whole body while still eating. You could do this first and the do master cleanse later with less discomfort.