Hario Filter in Coffee Bottle-Cold BrewThis is one of the easiest, and best looking, ways to brew cold brew coffee that we've come across. Hario have created an easy to use, easy to clean cold brewer, that won't look out of place on the dinner table when your friends come to visit. Simply place your ground coffee into the filter chamber and screw the top in. Put the bottle in the fridge for 8 12 hours, and when you're ready, remove the filter and screw the top back on.