Allow 2 tablespoons regular- or fine-grind coffee for every 3/4 to 1 cup water.
This needs special equipment.
Measure water into lower bowl. Place on heat. Place a wet filter in upper bowl and add the ground coffee. Insert upper bowl into lower one with a light twist to ensure a tight seal. If your equipment has a vented stem, you may place it, already assembled, on the heat.
If it does not have this small hole on the side of the tube above the hot-water line, wait until the water is actively boiling before putting the upper bowl in place. When nearly all the water has risen into the upper bowl--some of it will always remain below--stir the water and coffee thoroughly. In 1 to 3 minutes, the shorter time for the finer grinds, remove from heat.