San Pellegrino is amazingly good. So far beyond Perrier that it is untrue. Malvern Water is a pretty close second though.
I'll have the odd Coke. Not wildly fond of it, my soda of choice is Old Jamaica Ginger Beer (despite it's name, non-alcoholic), but it is bloody hard to get in most places. Coke, on the other hand, you could probably be the first person to land on Mars and you'd find a case waiting for you.
Am I the only one to prefer the taste of soda in glass bottles rather than plastic or tin? It just seems to taste much better for some reason.