Do you bath your pet birds?

I wasn't really aware of the dangers of using tap water for bathing or drinking as it were. So I guess it's rather fortunate that I don't have an birds. That said I use water from the Brita pitcher for the cat and the dogs and that seems alright - would it be okay for birds or are they rather more delicate in nature do you think? I'm thinking of getting a bird for my mom and I'd like to know these sorts of things.