If your in an Hard water area and your worried then a water softener is maybe what your looking
Other than that for filtering water I would buy a Sawyer mini filter and fit a seperate drinking tap in the kitchen
the charcoal filters are more or lease a con as they Are really any good if you have a natural drinking source
And take away the taint in the water,
Take a look at Sawyer filters! Yes they more on traveling but they shouldn’t be pushed to one side,