Coffee in water! I use a French press and pour it through a V60 filter because I prefer a clean drinking experience. My most used recipe for cold brew is 500g water and 83g coffee (1:6 ratio) and leave it for 24-48 hours (depending on how much warning I have).
Do you need a French press if you filter the coffee afterwards? I currently do not own one and wasn’t planning on getting one. My idea was to just dump the coffee in water, stir, let it brew, then filter.
Also, I assume you use a fairly coarse grind when brewing that long?
You absolutely don’t need a French press—I just find it’s easier to clean than the bottles I have. When I kept my French press far tucked away I used bottles and pitchers for cold brew before pouring it through the filter to catch the grinds.
And yes, I grind quite course. I have the Fellow Ode with SSP burrs and move it to the most course setting.