It used to be that I couldn't survive the afternoon without coke zero, but I've doubled up on the Starbucks in the morning and now I survive all day on perrier or something equivalent. con gas all the way.
I'm a Pepsi Max girl! I am trying to wean myself off it though as I know it is really bad for me. Otherwise I down a couple of large mugs of tea each day. I work in a really hot environment (my loft/attic office) so a cold drink is essential.