it depends on where you live. I have heard it told that is is highly recommended that you NOT drink tap water in mexico. But in most places tap water is better (not to mention FREE! rather than $3 a bottle) than bottled water.
its very healthy.. bottled water apaprently has more bacteria!
only if the tap water is hooked up to the shitter
If there was anything unhealthy about tap water, the supplier would get sued to death, so yes, tap water is completely safe. No matter how it tastes.