I have very low standards for coffee, use Starbucks bulk beans off of Amazon, and brew it in an automatic mill+drip machine. But a Brita filter for the water makes a world of difference.
I liked the water in Toyama, but they had a PR campaign to brand it as “oishii mizu” so people would forget about the cadmium poisoning in the Showa years. The PR campaign worked on me. :-) https://en.wikipedia.org/wiki/Itai-itai_disease