Pour over from ceramic, no plastic. Rinse it before and warm it up a little with the hot water.

Electric grinder with flat (not conical) burrs. Buy one were the burrs can be changed - you don't want to buy a dozen grinders to experiment - you want an arsenal of a dozen burrs depending on occasion, mood, beans.

Yes, that means the cost ratio of ginder to coffee machine (ceramic v60) is 300x. Three hundred is the perfect adequate ratio of how much more important the grinder is.

Light roast beans. There is no taste left in dark burnt stuff. Enjoy the nuance. But knowing the story of the beans is important as well.

Tap water is fine if it's not too hard and not chlorinated. Play around with the temperature, it does in fact change the taste.