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Use fresh, cold water. Because perfect coffee is over 98% water, filtered and bottled water is preferable. Some mineral content is desirable although this will depend on the quality of the water in your area. Harsh chemicals in your water source can seriously affect the quality of your cup of coffee. After all, if you're going to buy gourmet coffee beans and invest in a good coffee grinder and brewer - it doesn't make much sense to then spoil the final cup with poor quality water.