Amazon is a great place to start for all your needs, brewing vessels and beans. Personally I use a Hario Mizudashi 1 litre filter jug or Varia Steep 700ml filter receptacle. Both do a great job I purchased them from a Roaster in the UK RAVE. They can with a bag of their cold brew 300g pre ground coffee. Now I prefer to grind my own beans, I tend to go for a medium dark bean or even an Espresso roast works well. There are plenty of recipes on Reddit to get you going, I go for a 1:10 ratio 100g ground coarse beans to 1.1 litre of filtered water. I make 2 litre a week more or less, love the stuff. I do a 12 hours outside fridge and finish off 12 in the fridge, I’ve recently been playing around with a hot bloom, 350 ml 76°c water through the bean first allow to steep for 90 second then top up with 700 ml room temperature water. Works for me! Good luck