I had a CT scan in January when I went to the ER for a bad flare. I had to drink a quart of something that they said would "light up my colon" for the scan. It was mixed with apple juice and ice and was not bad at all. I drink a lot of water and ice tea, so a quart of weak apple juice was not a problem to drink over a 2 hour period. I would say don't worry, it is nothing like the colonoscopy prep !