Drink it cold, refrigerate overnight, and also I added crystal light capsule to it which was a recommendation from my doctor and it seemed to really help.
When I started out drinking it. I would drink 1/2 a glass every 15 minutes. I really should say I would just down it.
I forgot to add that for me this was the worst part. I did not mind the diet that you start 2-3 days prior to your appointment, and as for the actual procedure, I remember laying down and next thing that I knew it was over. I had not even realized that they had begun.
My procedure was performed in a hospital and I was given a clean bill of health and told to return in 10 years.