Good water is important to great coffee. Seems obvious, but I'll say it anyway. Of course, that being said, you can't "fix" bad coffee with good water anymore that Olympia beer could improve the taste of their product with artesian well water! I live in Sunnyvale, where we drink well water from our tap that is decent, but not as clean a taste as I'd like. Top that off with some older plumbing and it's not the most flavorful water. I still drink tap water, and use it for cooking and brewing some of my personal cups. However, most the time I use bottled water from one of those pure water companies that basically filter the local tap water. It does make a difference in the taste, both in glass, and in a fresh-brewed cup of joe. At 25 cents a gallon it's worth it.