Cultivating rosemary

I've got some rosemary that I purchased for a meal that is about to go bad. I've dropped a sprig in a clay pot filled with water, but I'm not sure how it will do.

Three people I know have had very good luck growing rosemary in water, but I have been unsuccessful in doing so. I'm not sure if it's the lighting, or timing, or perhaps I have a black rosemary thumb. I've read several different websites that offer advice about growing rosemary and so far none of them suggest growing them in jars of water.

My yard gets about 6 hours of sunlight a day now and temperatures are very warm. I'm hoping this time I'll be lucky.

I dried some of the rosemary sprigs and put it in baby oil, to try to make some rosemary oil. I have got to stop using baby oil as a base. That's the stinkiest stuff ever.