I recently brewed an amber ale that has an odd aftertaste and mouthfeel to it. It isn't bad, exactly, just odd. I have pored over lists of off-flavors and can find nothing that comes close to describing what I am tasting. I did treat RO water (my water sucks), and am wondering if I overdid it. What would a beer taste like if I over-treated the water (just general impressions are fine here...I know that without knowing all of the additions I used it would be impossible to nail down exactly what I over-used)?