I was recently on the road with my espresso machine, and since I didn't know the water quality I just bought distilled water and used 3rd wave espresso minerals. In doing this I realize a gallon lasts me over a week, and as a result I think I'm going to just stick with doing it even at home. I was at whole foods today and saw they have a RO water dispenser.

I figured getting myself a glass jug and just filling it up here when doing groceries could help reduce plastic, but they have three different offerings (I never knew there was so much to water ha ha) they have Reverse osmosis, deionized, and high ph. Which of these would be the most appropriate for an espresso machine? Or should I just stick with the distilled?

Also, I only use the 3rd wave product because a sample came with my machine, but if there is a different mineral pack out there that you all are liking better, I'm all for trying new things

Thanks for the guidance

I am on my own well. I bought a water cooler mostly for my coffee. I know there is plenty of topics about third wave water or making your own. I believe RO water is just fine for my personal taste. Calcium kills machines. Luckily around me there is very little calcium in the water. You can test this with trips from a place that sells fish. There was a night and day different in even the cheap drip coffee using bottled water vs my well.