Water doesn't taste different. Or, at least various kinds of water don't taste radically different from each other. I've thought about this, because yesterday I was prompted to try a particular brand of Welsh water, because it tasted "lovely". Just to be perverse and piss off the person who offered it to me, I refused to taste it. This morning, my curiosity got the better of me, and I had a glass of it. It was a thoroughly underwhelming experience. The water tasted like water. I don't quite know what I expected it to taste like - "oooh, this water is unusually moist! Does it have a higher proportion of oxygen ions?" Ok, admittedly, tap water does taste different from mineral water, because the government is probably pumping some kind of mind control chemicals into it. And the water in my secondary school was a different colour to what it should have been, so I conspicuously avoided drinking it. In any case, I would be very hard pressed to describe the taste of water as "lovely", whether it come from a spring blessed by the gods or wrung out of a dirty tea towel. You're onto a loser if you're up against the likes of beer or gin.