What were his findings? Flavor profiles, it turns out, will change depending on location, similarly to how wine is affected by terroir. Water is measured in TDS (total dissolved solids), or the amount of minerals it contains, Riese explains. Different combinations and amounts of magnesium, calcium, and potassium can affect the taste. For instance, glacier water tends to be smooth and fruity because they’re floating blocks of pure ice. On the other end of the spectrum, S.Pellegrino comes from natural springs that have made contact with underground rocks, thus causing it to taste a tad salty from the higher mineral content.

Throughout his career, Riese has sampled over 1,000 varieties of water from all over the world, making him a man of particular tastes. The melted result of a summertime harvest of a 15,000-year-old Canadian iceberg, Berg water, Riese will tell you, is as “extremely smooth on your palate, like literally, extremely, smooth.” If a restaurant only offers the kind of H20 he loathes, he’ll leave. At home, he chills his bottled water in a wine fridge set at 59 degrees Fahrenheit. And believe us, he’s not a fan of adding ice and lemon wedges to water.

With a palate like Riese’s, you won’t find him seeking out New York or L.A. tap. But, contrary to popular belief, he insists that there are times when tap is better than bottled spring. That’s not the only surprising #knowledgedart our country’s foremost water expert dropped on us. Here, Riese debunks 8 major myths behind our world’s most ubiquitous beverage.

Myth: All water mostly tastes the same.

CanO Water, canned spring water from Austria

CanO Water, canned spring water from Austria