I've lived extensively in America (12 different states), Canada, the UK, Ireland, Spain, Germany, France, Italy, Greece, Japan, Korea, Australia, and New Zealan

I've lived extensively in America (12 different states), Canada, the UK, Ireland, Spain, Germany, France, Italy, Greece, Japan, Korea, Australia, and New Zealand. The tap water tasted fine in everyone one of them. ¯ \ _ ( ツ ) _ / ¯ The most disgusting water I taste consistently is from a plastic bottle. In your defense, there's a big difference between room temp, tap cold, and chilled water. At room temp there is a flavor of water. Chilled with ice or a fridge mutes flavors. If you did a blind taste test of chilled tap and "filtered" chilled water you wouldn't be able to tell a difference. Consequently, if you did the same test at room temp, you'd find both to have bad flavors.