For my MRI I had 3 bottles of a watery barium solution to drink, one every 15 minutes, which helps them see the intestines better. It doesn’t taste too bad (colonoscopy preps are way worse). After that I had an IV put in, drank a large glass of water, laid on the table and into the machine I went. You have to hold still and will hear lots of loud noises and a few times they asked me to hold my breath. I was given an injection of glucagon in my IV to slow down my digestive system and towards the end they added contrast solution in my IV. The drink did have a little laxative effect but nothing extreme. In my opinion this is one of the easiest tests I've had to go through.