Just in case you may not know the difference between a pouchogram and a pouchoscopy, the first one I believe they inject contrast material into the pouch and is it done to determine if there is anything functionally wrong with your jpouch. They want to watch how your pouch empties. I am having one of these in the next month.
If you are having a pouchoscopy to view the jpouch with a scope you usually fast the night before and sometimes take a couple of enemas the morning before. Some GI's have you drink some type of solution but my surgeon never recommends it and in cases where you may have pouchitis, he certainly thinks it can do more harm than good. My GI did want me to drink the liquid and I told him my surgeon said no and he agreed so all I did was one enema the morning of. I think the GI's want the pouch as clean as possible when viewing it and that is why they recommend a drink. When I have a pouchoscopy with my surgeon, I never have any prep other than no food or drink after midnite.