Or buy a Hario cold brewer. https://www.amazon.co.uk/d/Teapots-Coffee-Servers/Hario-1000-Mizudashi-Cold-Coffee/B00I7JKAQ0/ref=sr_1_1?ie=UTF8&qid=1498224880&sr=8-1&keywords=hario+mizudashi
I use about 80 grams of filter ground coffee to about 800ml of water.
@Sumo started
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Or buy a Hario cold brewer.
https://www.amazon.co.uk/d/Teapots-Coffee-Servers/Hario-1000-Mizudashi-Cold-Coffee/B00I7JKAQ0/ref=sr_1_1?ie=UTF8&qid=1498224880&sr=8-1&keywords=hario+mizudashi
I use about 80 grams of filter ground coffee to about 800ml of water.