Polyethylene glycol 3350 with electrolytes
"This works. Fast. I did take a suggestion and add a packet of flavored drink powder but it was so foul, I'm not sure it made any difference. I struggled with nausea during the first liter, so for the second liter, I poured the swill into a chilled stainless steel measuring cup and slammed it. Gawds bless all of us who have to drink MoviPrep!"