Well, I hope everything goes well and smoothly.
My dad drinks Diet Coke and Coke Zero, I used to pay him out about it (he doesn't drink coffee, which I understand - I don't either) but he seems to genuinely need it for his work, since he's working and driving so often, usually up til late hours. Isn't doing him much ill as far as I can tell, so that's okay. But yeah, the whole feel of soft drinks is just uncomfortable for me now! As for energy drinks, I used to hate that, I've grown sort of used to them, but not in excess. They can make you feel terrible. I had a 500ml one recently (500ml! Why the hell do they sell them in such large cans?) and I felt completely out of it for the rest of the day, headaches and all. It's dumb, that particular drink boasts about being twice the size of most other energy drink cans and thus more "macho", even though it's a product that shouldn't be aimed exclusively at one gender... this is a theme with many Australian advertising campaigns and I'm rambling now, but Axxo knows what I'm talking about.