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Food And Drink Not Allowed. What is not allowed prior to a colonoscopy is milk, soy milk, creamer, or any other dairy product. These should not be taken in coffee or tea before a colonoscopy. Depending on the time of the test, even clear liquids must be discontinued a few hours prior to the colonoscopy.
Report Abuse. 1  Water is a clear liquid and that's what you should probably stick with. 2  I definatly wouldn't! 3  Usually the doctor asks you to fast about 12 hours before the colonoscopy is performed.  No, you can't have any alcohol the night before this procedure. You don't want to take any chances of having a reaction when they put you to sleep to do the procedure. jackie_jabar Â· 9 years ago.