It doesn't even have to be stranded really, it's just a bit easier to work with. Any old stranded wire will do. If you're using quick disconnects, just makes sure you get matchin disconnects and wire... one is for 14-18gauge i think, and the other is 20-24??? Or something similar... just make sure you get the right stuff for the right connects.
Really though, any old wire will do... Cat5, stranded, solid, and gauge isn't critical at all. Just go to your local Radio Shack or what have you and pick up what they have on sale
