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2- Water Quality:

Water quality is a crucial factor in the taste of a cup of coffee, as it makes up over 98% of the cup. Water is an excellent solvent (especially hot water) because it has the ability to dissolve most types of molecules. Pure water interacts with the solid components of coffee differently than impure water (simply put, the particles that make water hard, or have an unpleasant taste).

Usually, if the water tastes good without additives, it will be good for making coffee. Unfortunately, this is not always guaranteed. The total dissolved solids in water affect the coffee extraction process and should be within an acceptable range. Some expensive bottled waters that contain very few dissolved solids can make coffee tasteless. Tap water can be hard and affect the taste of coffee. Using bottled water or filtered water (with a filtration system) is recommended for making good coffee. This is why specialty coffee shops pay close attention to the quality of the water they use.