Weigh 55 grams of coffee and grind on a coarse setting. The grounds should be about the size of kosher salt.
Twist to open filter, then add coffee to bottom compartment. Reattach top of filter.
Twist the filter into the top of the bottle.
Attach filter and top of bottle to glass bottle base. Fill bottle to top square mark with cold, filtered water. Shake gently.
Let brew for 8-12 hours.
After 8-12 hours, gently shake to stir the coffee. Remove the filter.
Place top of bottle back onto glass base, open spout, and pour over ice.