Teenagers starting rumors about mother?

I have a teenage daughter and I am close with her friends. Our house is sortof the hangout spot. I prefer this so that i always know what is going on. Two weeks ago, several of us went to a local swimming spot out in the middle of nowhere. I took along ONE wine cooler. Somehow, some of the teenagers have morphed this into me buying alcohol for all of the kids there, popping pills and getting sick. I am extremely concerned about this rumor getting out of hand. I have no idea what to do to protect myself. I no longer allow all of the kids to hang out here. That was the only conclusion I could immediately come to. Does anyone have any suggestions on what I could do to protect my family and myself from rumors gone rampent? Let me be clear that I do NOT buy alcohol for my daughters friends and I do NOT do drugs.