Huge difference between cold brew and throwing ice in coffee. Huge. I beg you please don’t do it. You can brew coffee in cold/room temp water. Make a jug instead of a cup (do the math for ratio increase, it’s worth it) let it steep overnight - 12/13 hours if you can. Soooo much better. Tastes naturally sweet without the heating process. Spark one and enjoy. Same thing with tea. You’ll never want to buy crap from a chain after.