This is one of the more popular commercial setups.

https://toddycafe.com/toddy-cold-brew-system

I prefer a coffee sock and a gallon glass jar. 12 oz. of coffee on the counter for 12 hours and you are good to go.

https://www.amazon.com/CoffeeSock-ColdBrew-Filter-Certified-Reusable/dp/B015WTS0RS/ref=sxin_3_ac_d_pm?ac_md=2-0-VW5kZXIgJDE1-ac_d_pm&keywords=coffee+sock&pd_rd_i=B015WTS0RS&pd_rd_r=45644cf3-98f2-4160-8b80-661607b5eb18&pd_rd_w=0lsUO&pd_rd_wg=upwNC&pf_rd_p=24d053a8-30a1-4822-a2ff-4d1ab2b984fc&pf_rd_r=35C6GYY1NGEMM77M5AQ6&psc=1&qid=1574886893&s=home-garden

https://www.amazon.com/Empty-Gallon-Airtight-Leakproof-Plastic/dp/B075JR6H11/ref=sr_1_8?keywords=one+gallon+glass+jar&qid=1574886910&sr=8-8

There are coffee socks and I think you could rig it up around the filter, here's one

https://www.amazon.com/CoffeeSock-ColdBrew-Filter-Certified-Reusable/dp/B015WTS0RS

Another thing that would help is buying coffee that's coarsely ground already, I know Bizzy coffee on amazon is ground specifically for cold brew, so I would try that or any other coarsely ground beans

Hope this helps!