The art to the perfect cup of iced coffee is all in the drip. The DRIPO is a $24 cold brew system from gosh! (yeah, that’s really the name of the brand) makes 10oz of coffee in as little as two hours, and has a built in mug. Make Japanese-style cold brew, which is less acidic and harsh, in a travel-friendly package.
You don’t really need the micro-filters that they use, but it does help distribute the water evenly.