if you are just talking about having some one hand for iced drinks what I use is the reusable ice cubes...sounds terrible doesn't it
but they work well and take up next to no room, I just keep them in a box in the freezer.
https://www.google.com/search?ei=IEr...71.MNp56PMtbkw
I run them through the dishwasher in the silverware bin after each use.