<human>:  How can I make the best iced coffee?
<bot>: The best way to make iced coffee is to cold brew it. To do this, make a strong concentrate of coffee by combining 4 parts water and 1 part coarsely ground coffee. Allow the mixture to steep in a pitcher or container overnight in the refrigerator. When the concentrate is ready, fill each glass with ice and add equal parts of the concentrate and cold water or milk (or different ratios, depending on your preference). Serve immediately and enjoy!