I would suggesst that you get use to fasting before trying the MC. I had fasted for years before even finding out about the Master-Cleanse about 7 to 8 years ago. Having had the experience of doing short weekend fast made it very easy to last 20 days on the MC. Try the Master-Cleanse or juice fast for a weekend without the salts and get use to the different feelings while fasting. Then try a Water Fast for a day or two do get use to how the body feels and reacts to a very high detox rate. After 1 or 2 weekend fast you will be more prepared to take on a long Master-Cleanse fast. If you cant stomach the Sea Salt you can still do the MC with eliminating the SWF. You will end up being a little more brain foggy since your not flushing out the toxins.
I use Baleine Sea Salt because i can find it in the local grocery store. Celtic or keltic..cant remember name.... is supposed to be one of the best but you must likely would have to order it on line.