Q. A 28-year-old female presents to the outpatient department with a 2-week history of watery diarrhea, bloating, and flatulence. She recalls that the symptoms started a few days after she returned from a camping trip in the Rocky Mountains, where she consumed stream water. She denies any fever, blood in the stool, or weight loss. Her medical history is unremarkable, and she is not on any medications. On physical examination, she appears well-hydrated with a soft, non-tender abdomen and normal bowel sounds. There are no hepatosplenomegaly or palpable masses. A stool sample is obtained: light yellow, greasy, and foul-smelling. Microscopy reveals pear-shaped trophozoites with flagella and two nuclei. What is the next most appropriate step in the management of this patient?