A 19-year-old presents complaining of vaginal discharge and itching for 3 days. She is sexually active and uses condoms most of the time. A physical exam reveals the following: vitals are normal, abdomen is soft and non-tender, bowel sounds, the pelvic exam is notable for moderate discharge with no masses or tenderness. Her wet mount/KOH prep reveals 20 wbcs, 2 bacteria, no hyphae, 5 to 7 clue cells. What is the most appropriate treatment