Suprep Bowel Prep Kit
"Not the best tasting stuff but if you drink it fast it's not so bad. 
I drink a lot of water on a regular basis so it wasn't as hard to get down the additional fluids.
it has a bit of a bitter aftertaste but it's manageable. It worked within about 20 minutes for me.
I'm looking forward to taking a good long nap after my procedure this morning."