First things first: coarsely grind the coffee beans! Yeah, this is annoying. For a year I’d try to make coldbrew coffee with already ground beans, and grinding them definitely is better. I used my grinder thing for my vitamix. Just make sure they are COARSELY ground, this way you won’t have granules floating in your drink (which is one of the worse things ever in life, in my opinion). Once the beans a freshly ground, add them to a large bowl or pitcher/container/jar. Add the water and stir to mix. Let this mixture sit overnight in the fridge. I have heard both ways: at room temperature and overnight. I prefer it from the fridge. (Also as a note, sometimes I made this in my french press too. I just don’t have a huge one.)