I do the classic cold brew method in a Bell Jar.
2/3 cup coarsely ground really good coffee
3 cups cold water
Combine, put lid on, shake, let sit on counter overnight. Strain thru a small strainer lined with paper towels. Makes about 4 iced coffees.
If you are feeling kooky, freeze some in ice cube trays to use as non-diluting temp control. Awesome!