Would sound absurd to all but the nerdiest, most dedicated, but have you considered making your own water[0]?
reply[0] https://www.baristahustle.com/diy-water-recipes-the-world-in...
Or just buy bottled water. If you're only doing Espressi, a 1 liter bottle can take you a long way and comes in under 1 Euro.
replyFor a daily thing like coffee I gotta set myself up for the most sustainable path or it feels like I'm accepting the waste
replyVery neat!
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