how to i get a court order to have my son attend a drug and alcohol treatment center?

My son who is 17 has a drinking problem. I found two big bottles of vodka in his room and vodka concealed in water bottles in his refrigerator. I have found a treatment center in the area that I have made an appointment with but my son refuses to go saying he doesn’t have a problem. The treatment center said I might have to get a Court order issued. How do I go about doing that if I can’t convince my son to go.