I use something like that from Amazon. Here’s an awesome tip for you. Rather than putting the grounds in the strainer, I just add it directly into the mason jar and let it sit over night without inserting the cylinder strainer. Then when it’s done cold brewing, I insert the strainer to filter out the big particles and then put this flip top cap on it to pour over into a separate container while using a nut mesh bag to get the finer particles.

Fliptop cap for mason: Drink, Pour, Store! Wide Mouth Mason Jar Flip Cap Lid by County Line Kitchen with Airtight, Leak-Proof Seal and Innovative Flip Cap (WIDE MOUTH, Blue, 1 Pack) https://www.amazon.com/dp/B0776YQTLS/ref=cm_sw_r_cp_api_i_tV.CDbG70SRQF

Nut bag mesh strainer: 2-PACK Best Nut Milk Bag - Restaurant Commercial Grade by GoNuts - Cheesecloth Strainer Filter For the Best Almond Milk, Cold Brew Coffee, Tea, Juicing, Yogurt, Tofu - BPA-Free Nylon 12"x10" Fine Mesh - Durable Washable Reusable - FREE Recipe E-book https://www.amazon.com/dp/B00WFU80KA/ref=cm_sw_r_cp_api_i_-X.CDbF4N6DW3