You can make fresh, cold coffee without a fancy machine with the Asobu Cold Brew Coffee Maker. You just add some coffee grounds and 24 ounces of water into the plastic brewer and let it sit at room temperature for 12-24 hours. When the steeping is complete, press a button to transfer the coffee into the stainless carafe, add ice cubes, and you can take iced coffee with you in the carafe. I suppose, if you prefer hot coffee, you could omit the ice cubes and just nuke a cup of coffee as you drink it.
The carafe is a double-walled stainless bottle with copper insulation to keep the coffee fresh and cold for up to 24 hours. It holds 32 ounces, to allow room for the addition of ice. The brewer is made of BPA-free Tritan plastic, and it has a reusable stainless steel mesh filter.
The Asobu Portable Cold Brew Coffee Maker is available with a stainless, copper, or black carafe for $49.95 from The Grommet.