Fucking annoys me when people moan about limescale in the water, thats how its come out the ground which in the south is mainly chalk, its as natural as you can get, does you no harm and tastes of virtually nothing.
If you come from up north or scotland then yeh it might taste a bit different but its not wrong or bad for you in any way, just different.
We really do need to get a grip and stop being so precious about stuff like this.