I just un-clogged my coffee-maker, fortunately didn't damage the silicone rubber hose.
But here's a good place to get replacement hose-- or any other ridiculously obscure component-- They don't do appliance parts, just general industrial stuff.
www.mcmaster.com
I didn't measure my hose before I put mine back together, but it looked like about 1/2" ID x 5/8" OD, and very soft, looks like 50A durometer to me. Here's the part # you can type it in, and get to the correct page in their catalog.
5236K38 $1.26 per foot- you might have to buy a whole foot and cut to length -should be easy with scissors-- opaque red (but you can get any color) CHECK the SIZE FIRST. Most of the cost will be in the shipping. You could also call up a local distributor of industrial supplies/or maybe a general appliance parts store, but they often have minimum orders.