Polyethylene glycol 3350 with electrolytes
"I started a clean diet a day in a half prior to the procedure. I then made the solution and refrigerated it that morning. I sucked on a lemon slice and then drank the stuff for 4 times every 15 minutes. When finished it took about an additional hour and 15 to start. No problems, worked fine.  
The trick clear liquids a day and a half prior. 
 Happy squatting to all, and use flushable wipes and end with toilet paper to dry."