Water into blood

Hey I have a question and wonder if anyone has any good ideas on how to approach this. I am doing a 48 hour film project in atlanta coming up and one of my ideas is going to be when someone turns on the water faucet in the kitchen, the water turns to blood. What do you think the best way would be to approach this? I was thinking of just shooting a blank plate of the faucet then adding in fractal noise to look like it was running water itself. but I would rater use real running water so that it could just make the change. Any advice is greatly appreciated.