Had a colonoscopy last spring, prep isn't nearly as bad as one would think it is. I was prepped with NuLYTELY, which came with its own flavor mix, it tasted like a combination of salty Gatorade and powdered milk in my opinion. I have a weak stomach and I managed to finish the prep, never imagined I would but I was determined to get this over with lol. I did best drinking it cold as possible and out of a straw so it had minimal mouth contact. I drank orange Gatorade all day while I was prepping and no problems, the green jello I ate showed up though which was kinda amusing. Honestly after the procedure was worse then preparing for it, but that was just pain in my intestines for a couple days and it wasn't unbearable or anything. You'll be fine, best of luck!