You will get 2 drop maximum each day an a total of 4 each week. Half will be weapons, and half will be crates. That means that you will get 1 gun and 1 normal crate one day, and the other day you will get one weapon and one e-sports crate. If you don't want to play but still want drops, you can go to servers that are dedicated to idling.
Also, if you are interested in good quality, your best bet is to open crates. My experience is that the skins you get dropped don't have very good quality (field tested, well-worn etc.)