I stole this picture off of HBT... A few months ago. I cant remember who did this, but they bought an adapter that splits the water to the faucet and a ball valve, neat little DIY project. You can go to HD and buy the adapter and the ball valve, plus some other attachment. I bet it
would be less than $20, maybe $30 at the most.
I am going to try this for my winter brewing, the Colorado water that comes out of the tap is very cold! I actually have everything from various home improvement projects, I just need to put it together.