I buy my water instead of filtering it. I tried to use 5 gallons of city water ran through a Brita filter, and all my beers ended up having a funny taste. I used to just buy generic "drinking" water from Costco, and this last IPA I made was the first time I brewed a recipe (not a boxed kit) and also the first time I used Arrowhead brand water. It turned out great. Anyone here have a brand of water they prefer? Does anyone here swear by Arrowhead water?