nah, too much hassle, you could actually just wait for a month or so, prolly one day she's going to invite you to lunch, put it on her if you have any chance (careful if there's another person there)
All things considered, it's probably a good thing he poured that shit in the sink. That tea was like a year old by that point, and love potions tend to break down within hours anyway...
Not that I would have any first-hand knowledge of love potions. =_=