In an automatic pour-over coffee maker, the best water is filtered or bottled water. This type of water is free of impurities and chemicals that can affect the taste of your coffee. Additionally, it's important to use cool water when brewing coffee, as hot water can alter the brewing process. If you don't have access to filtered, you can also use bottled spring water. Avoid using tap water, as it contains organic materials, minerals, and chemicals that will affect the taste of your coffee. You can ensure that your coffee tastes its best by using filtered or bottled water. Some people prefer to make their water recipes by mixing distilled water and minerals. That's certainly an advanced option, not suitable for the faint of heart.