A married couple were at a music festival in Queens the other day, explaining how to bring someone back from the dead. Their method: naloxone nasal spray, which is commonly called Narcan. “Just stick it up your nostril,” Ingela Travers-Hayward, a former documentary producer, said, demonstrating on herself. “Then press in the plunger, and that’s it.” Narcan, which temporarily reverses an opioid overdose, recently became available without a prescription. Increasingly, party drugs and pharmaceuticals—Molly, meth, Adderall, cocaine, even CBD gummies—have been found laced with fentanyl, which is about fifty times stronger than heroin. Last year, more than seventy thousand people died from fentanyl overdoses. “I always say, ‘Knuckles to nostril,’” Travers-Hayward’s husband, William Perry, added. “It just gets it up in there! Then put the person on their side and…