Good advice John. Nothin' to it. Fast for 48 hours, drink the PEG w/electrolytes the night before. Takes about five to six hours to down and out the whole four liters.
Keep it cold, put it on ice if you need to, chug eight ounces at a time. Lemon/lime and cherry flavors are the best (or least the best of

).
Due to a medical condition that greatly increases my risk of colon cancer, I get to have that party every year. Been doing it annually since 1998, with a few extras thrown in. Three years ago the doc found a mass he couldn't excise with the scope tools, so they opened me up and took a foot of my colon. Pre-cancer but still benign (whew).
I too have known people who died from colon cancer, don't plan to join them.
Let me add to John's good advice: If you notice
ANYTHING to do with your guts that's out of the ordinary-diarrhea that won't go away, constipation that won't go away, bloody poop etc., etc. GET TO A DOCTOR, STAT.