Suprep Bowel Prep Kit
"HERE IS THE TRICKS; it tastes so bad,
1) add large ice cubes
make it very cold and you won't taste as much
2) my second dose I took straight up pretty much with just a touch of white grape juice and chased it with green tea, or let the green teas just swish in my mouth to get rid of taste
those tips will help; 
other than that it works and you can! you can! get through 2nd dose with these tips."