Why not lay off the Miracle-Mineral-Supplement for a couple of weeks and do some very gentle colon cleansing using gentle things like Slippery Elm or Apple Pectin plus a mild stimulant. Avoid harsh fibers for now. Flax seeds soaked in water, strained out and the resulting "Goo" makes a nice lubricant for the colon. Along with the Liver Cleanses and enzymes this might help soothe your bowel and lessen the gas, bloating and urgent movements. Then start the Miracle-Mineral-Supplement back and find your comfort level. Some will disagree with me, but I do not believe huge doses are always the best. You might want to take six drops in the morning and six at night instead of a single large dose. Or, if even a small dose of Miracle-Mineral-Supplement gives you the "Big D", try just a drop or two in the morning and a larger dose at night. Find out what works for you and stay there for a while. You can experiment with more on your days off. I can feel for you, I have a 23 mile commute through mostly rural areas. There is one gas station on my way to work. By the time I reach town I am almost at work.
(Completely off topic-this is why I hate the salt water flush so many people swear by)
Let us know how you like your homemade green drink. For now, its easier for me to get ready made, but I do add a couple of extras like carrot pwder and noni powder.