I've worked in a coffee shop for 100,000 years and experimented there to find my favorite way. I use a french press and brew it extra strong (almost double the grounds). Then I chill it with some ice in a pitcher. I don't like sugar in my coffee, so I just add milk by the glass and sometimes flavor extracts. I only make enough to use within 24 hours, preferably only 8.
I wanna try out the cold brew method.