Suprep Bowel Prep Kit
"After forking out $86 (!) for this stuff I followed the instructions and it worked without issue within an hour. Just make sure you're near a toilet for the next couple of hours afterwards. I didn't find the flavor all that bad, it wouldn't be something I'd choose to drink taste wise but it was easy enough to deal with. After the procedure I ate my usual food again and everything returned to normal a day later."