Comment by nchmy

You need to learn how to brew coffee, friend.

Bitter generally means "overextracted" (and sour is the indicator for underextracted) The remedy is some combination of cooler water (maybe 90C), shorter brewing time, coarser grind. Also, wait for it to cool off - excellent coffee is almost always bitter when piping hot, but gets delicious when it has become warm.

Freshly roasted beans, and freshly ground for the brew, is crucial as well. Green beans keep their flavor for, let's say, 15 months. Roasted 15 days. Ground 15 minutes. All preground coffee in the grocery store is garbage. (Let alone instant coffee, which was low-grade to begin with, brewed en masse, rapidly dehydrated, and the remaining solids put in a jar for rehydration)

Of course, many have no interest in any of this process, and that's fine. But they're stuck with bland and/or bitter coffee...

Though, you don't need anything fancy to make good coffee. French press is dead-simple and consistent, and you don't even need a French press - you can use any recipient (eg a jar) and then just carefully pour the coffee out and try to leave the sludge behind. A careful Cowboy coffee, essentially.

Give it a try - you might get some enjoyment out of your addiction. Though, I've basically quit coffee altogether as my body has become immensely sensitive to caffeine, to the extent that half a cup daily will subtly mess up my whole life.