Interesting. I love short poems that pack a lot of punch, like this one.
I'm not sure the poison is *diluted* well, if it's in a perfect balance with a benign substance intended for the victim. Of course, it's diluted well enough "for you" so my critique is rendered pretty useless by the POV. It was just the first thought that struck me, so I thought I'd let you know. I might be taking it too literally, I'm pretty thick sometimes. x-/
It's got a great flow to it, and it builds well to the final line. Cool.