You can make your own cold brew concentrate with a French Press, cold water, and an adjustable coffee grinder with a coarse setting.
If you really want to make your own barista experience at home: add in some milk to the concentrate, or use a frother for hot milk froth, or if you have heavy cream and a frother you can replicate the cold brew foam at Starbucks/Dunkin’. Torani syrup bottles for flavor. Torani caramel or chocolate sauce for topping.
(the actual cold brew concentrate is easy to make, it’s the rest of the add-ons that take a bit more YouTube expertise and figuring out)