I got into cold brew coffee this summer... but have made coffee lots of ways... I have espresso machines and grinders (and still have a set of those I use at work for my afternoon pick me up) and have also got a french press and a stovetop moka pot.
Cold brew process is pretty easy, you need a coarse grind and you stick your coffee in a basket in water, in the fridge, for 24 hours (can apparently brew shorter time if you leave it at room temperature) and then pull out the basket.... you end up with about 1L of coffee, and apparently that lasts in the fridge for about a week (mine gets drunk faster than that)
I've dialled it in pretty well now, mostly, though I am getting a bunch of fines from the grind that make it through the whole process.. if I'm careful with the jug most of it stays down the bottom as sludge, but the last cup gets a bit grittier than I'd like.
I tried filtering it with regular coffee filter paper from the supermarket, but the fines mostly go straight through the paper. Anyway... if I can fix that issue I'll be really happy.
Next step is to get a little gassing keg and some nitrogen bulbs, and do my own 1L batches of cold brew nitro coffee.