When discussing how whiskey gets its flavor, wood tends to get most of the credit. However, how water affects whiskey is just as dramatic, playing an important role in determining the quality of the spirit. It’s the reason why most Scotch and bourbon distilleries are located near a river or lake, making it possible for them to use the freshest, most local source.

Phrases such as “fresh spring water” and references to specific water origins are key selling points when it comes to marketing whisky. Sure, the wood is also a big deal, but if, say, a prestigious whisky such…