everything I have read shows tap and bottle water not much different. most bottled water comes from the tap anyway.
we give all our pets tap, fish, birds, gliders, dogs and cats. I have seen nothing in our city that suggest tap is bad.
funny story. a coworker was living in mexico, he always drank bottled water. Even at his girlfriends house he made sure to use their large bottled water dispenser. He was clearly instructed drinking tap in mexico would send him to the bathroom or worse.
after 4 months in mexico, one day he walked into the back yard of his girlfriends house, were he spent most of his off time, and found her dad filling the 5 gallon "bottled water" jug, with the garden hose. even thought he had not gotten sick, he started to bring his own bottled water to the house.