There are many excellent brands, blends, roast, and grinds of coffee available.
I suggest that you carefully consider your brewing method. One cup a day presents a serious brewing problem. I would suggest you look into cold brewing as well as finding a new brand. An inexpensive French press would work well for cold brewing. For my taste, a French press is the finest way to brew coffee but I've never tried it for one cup.
Actually, I brew 4 cups, but only drink one myself. Rest of the family also has a cup each.
My drip pot is clean and our water is pristine - filtered lake water in a rural area.
I’m going to start trying a new brand. Some of those recommended here.
I also may try a Cremex or just use the French press all the time. Maybe it’s the drip method that’s just not cutting it for me.