I had one earlier this year, and I did the same as Gilly as I was travelling by car. They usually like you to drink it a hour before your scan. The first time I went for one, I blew it, because I was travelling on the bus, and drank half the water before I left the house and the rest during the forty minute bus journey, not taking into account I had to change buses, and was forced to run into M&S before I disgraced myself at the bus stop. Then I had to buy more water and gulp it down in double quick time! It was like some medieval torture! You'll work it out. It'll be fine.
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