[cosmotic]

The post says don't use tap water, but what are the alternatives? Brita or Pur filter? Bottled water (that is most likely just tap water itself)? spring water? Distilled water? I suspect the only one without solutes would be distilled, but distilled makes for awful drinking water.

[anotherevan]

I think the rule of thumb regarding water is to not use water you wouldn't enjoy drinking straight. If you drink your water straight from the tap then go ahead and use it for brewing.

I have an under the sink in-line water filter and that's what I use to fill up the kettle.