The principle at work is not the ingredients in the lemonade but the fact that it is a mono liquid "fast" and it's main working modus operandi is giving the digestive system a rest and the energy normally used to digest food is used to cleanse and heal. If you eat ANY solid food organic or not you will NOT be "fasting" and all you'd be doing is having lemonades with your food.
You can start with other cleanses like colon and liver which don't entail the abstinence of solid foods. Do some research and ask questions in the colon cleansing and liver flush forums.
One of the unique things bout the MC is that you are getting vitamins, minerals and carbs to provide energy and I would say the vast majority of folks are able to lead their regular normal lives while doing the MC.
Generally the 1st 3 days are the roughest so it'sa good idea to start like on a friday. If you lack energy you just drink more lemonade and if it gets rough you can do a table spoon of blackstrap molasses for an extra energy boost.