Are you still living in the same area you were as a child? The taste of tap water changes a lot from place to place. There are some places where I still like the tap water, but in others I won't even drink it. In some places it even has a gross smell!
Pretty much. I lived in the same place when tap water stopped tasting good to me. And it was over the course of one summer when I started enjoying bottled sparkling water. It was sold in glass bottles back then.
Different places really do have different tastes. Sometimes it's even still distinct when you make tea.