You have confirmed what I had thought, I always have had used bottled,
I am right now experimenting. Im doing a 10 gallon batch, in two 7 gallon fermenters. one half using boiled city water for top off, the other non boiled bottled. I have never had any problems with the bottle water but it is nice to see if there is a taste difference. Im not going to try the unboiled city water, just because it seems obvious even though its clorinated that it would be infected by all the piping and crap it has to go through.
I will discuss my findings in about 4 weeks.