The Master-Cleanse works if you don't use the SWF (Salt-Water-Flush) every day.
Burroughs mentions in the book that you can substitute the morning SWF (Salt-Water-Flush) with LAX tea.
It is a better combination to do the tea at nite and SWF (Salt-Water-Flush) in the morning as the two work together to move out the most amount of stuff.
Some people can't tolerate the salt water or have too busy of schedules during the week to wait around for the last evacuations from the SWF.
So their option is the tea at nite, and in the morning.
Though some, like myself, get up extra early to allow for this. Its not fun but its worth it.
As for worrying about the digestion part and running to the bathroom constantly, it is different for everyone.
Some people may go often and others not that often.
The only other thing you want to have other than the lemonade and water is an occasional cup of mint tea.
Go ahead and let the boredom exist. Its actually a sign of detox, which is good.