I'm a big fan of Rivella (Switzerland), i remember in Hong Kong drinking Sprite Ice but i dont believe thats made anymore?
I also found in Germany fizzy apple juice but i can't remember the brand..
Love Mountain Dew (US version), i also prefer Dr Pepper in the US to the UK
Guarana also, although i find it amusing that the stock the Brazilian cafe at home sells is from Portugal, apparently its not quite the same