After seeing 'stringy things' in my drinking tap water, I decided (it hadn't killed me but...) I'd use bottled water.
Boil in the kettle and what a difference.
I buy 20 bottles of still water at my local 'cheapo' shop for £1.
Pour one bottle (500ml) into the kettle. It makes the perfect cup of coffee. You're boiling less water and you're saving on electricity too.
Does anyone else do it?