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Step 1. At 6PM the day before your procedure you can’t eat anything solid. You can only consume clear (see-through) liquids.  It is important to stay hydrated by drinking lots of clear liquids, such as sports drinks, clear juice like apple and white grape, clear broth and water. Soda is OK, and so are coffee and tea, but without cream. You can have gelatin and ice pops, but stay away from anything colored red, blue, or purple. The dyes can discolor the lining of the colon and make it harder for the doctor to see. Also avoid alcohol and drinks you can’t see through, like milk or orange juice.