bowel preparation
"I had to take this for a colonoscopy. Having not been allowed to eat all day for the day before the examination, I was quite apprehensive about putting this strange smelling lemony stuff in my mouth. 
Needless to say, I found it incredibly hard to drink. It took me around 2 1/2 hours to finish the first litre, starting at 5pm and finishing (eventually) at 7.30pm. It took about an hour for the medicine to work properly, after I was stuck to the sofa with bad stomach cramps. 
The second litre didn't go down well at all. I was very bloated and felt like I was going to vomit, which I didn't want to do, as then it would have all been for nothing. It's 5am now and still half a litre to go. Hoping it will be okay as I'm still stuck to the toilet."