Coarsely grind your coffee beans with a coffee grinder.
Pour about half the water into a 32 oz mason jar. Top with the coffee grounds, then fill with the remaining water (not all the water will fit, that's okay). Stir!
Cover the jar, and allow to steep for 8-12 hours. After done steeping, line a second 32 oz jar with a mesh bag or cheesecloth and pour the coffee into the bag. This will separate the cold brew from the coffee grounds.
Slowly pull the bag up out of the jar and squeeze out any liquid. Discard the coffee grounds. Add about ½-1 cup more water to the mason jar to dilute it a little bit. Store in the fridge or pour over ice and drink up!