I have a follow-up colonoscopy tomorrow, this is my twelve one. Every time before however, i was sick and had not eaten in weeks. One time I had to try it in the hospital, I could not stomach it and was already upset I was there again. They did it fine without. This time however I am healthy. So I am sitting here with a glass of this crap and I just felt like I couldn't do it. I started looking up different ways I could make it better. I found something and tried it and holy shit it worked! Excuse my language.
Take a dryer sheet and hold it over your nose. Take a deep breath in and DRINK only a small cup, ease into it. 4 cups, about 8oz each over a hour. You'll get it down. Have a lemon ready and take it almost like a tequila shot. Toss back the cup with the dryer sheet over your nose and then bite and suck the lemon instantly. Take a 10 min break and go back to it. At the end of your 4 cups, take a 20 min break and go back to it.
Its still terrible, but it's MUCH easier and MUCH better.
Hope this helps someone out along the way. I know I was relieved to try it.