I just had my colonsocopy today and a tip I received from the receptionist at my doctor's office made the prep so much easier:
--the day before your prep day, eat a very low volume, soft food diet.
Makes sense that if you eat food with a lot of texture and roughage it will be more unpleasant to expel. So the day before prep I ate mostly yogurt, creamy peanut butter (off of a spoon) and ice cream
No meat, fruit, vegetables, or nuts--definitely no popcorn! In fact if I had to chew it I didn't eat it.
On prep day, I glugged down my 64 oz of Poweraid Zero (mixed with Mirolax) and in four trip to the bathroom I was completely cleaned out. No cramps, no painful stools, no sore you-know-what. What a difference!