For better, cleaner tasting drinking water, fill up a glass pitcher with tap water and let it sit in your refrigerator for a day or two.

I don't know the exact science behind it, but it has something to do with the gasses trapped in the tap water due to pressurization when it first comes out of the tap. With enough time, they escape leaving you with much better tasting water. (I live in Chicago, so the difference this makes with Chicago water is more than noticable.)