I have had to drink that when I had my MRI - they told me for all abdominal screening you have to drink the liquid. It is gross, best advise is close your eyes, hold your nose and chug it. Drink it through a straw as far back as comfortable in your mouth and try not to think about it.
They also did a dye contrast during the MRI. I had a CT scan as well 2 weeks prior. During both they didn't find anything. The abcess that was getting bigger was going undetected. So I ended up in the hospital anyway. A dr told me while I was there "No more MRIs, no more CT scans". The 2nd time I was in the hospital (a week later) the first thing they said was "Nothing to drink right now since we might have you do a CT scan". That is when I put my foot down to the throngs of tests they were doing and said no. No, no more MRIs and no more CT scans. Know was they said?
"Ok."
I think often they prescribe these tests (in my case anyway) to put off actually looking at what is the problem. I have had test upon test that has showed nothing and am very frustrated since I am not any closer to a solution to this flare or the disease in general.
Hope yours went well! MRIs are best closing your eyes before you go into the tunnel and keeping them closed until the entiree procedure is done. If they offer headphones and music, TAKE IT, and listen to something relaxing and calgon-take-me-away-ish like Enya.