Buy a Brita and filters . You’ll save on the water and it will taste better.
A little digital ppm meter comes with it(that's what sold me, being a gadget freak), I get 160ppm out of the faucet (we have basement wholehouse 10-20 micron string filter, this helps the other filters last longer), 30-40 ppm form the Brita and 0 ppm from the Zero.
Ironically, coffee still taste better with the Brita, guess you need a little crap to help pull a good brew.