My son is prepping right now for his first colonoscopy. The stuff they gave him to drink 2 liters twice of..... well he called me and said he is going to vomit it is so horrid to him. He is trying to call into the doctor on call but seriously on a Sunday night I don't think he will have much luck. Can he add sugar to it? They gave him flavors to add, but he said they are horrid and it tastes to him like spoiled milk? Any help please.....He has to have this test tomorrow morning!!! Thanks so much.