A 26-year-old male active duty USMC First Lieutenant, on his first deployment to Iraq, presented to the medical clinic with one and a half days of loose stools. Over the previous 24 hours he reported four liquid bowel movements without gross blood. He also reported nausea without vomiting, abdominal cramping, and a headache. He denied any fever, chills, or night sweats. The patient had been in theater for approximately 4 months, and 2 days before his symptoms began he had the opportunity to sample the local cuisine. He denied known infectious contacts, use of any self-treatment, or any comorbid illnesses. On exam he was afebrile, his blood pressure and pulse were 128/82 and 84 while seated and 110/75 and 101 after standing for 3 minutes with lightheadedness. Respirations and oxygen saturation were within normal limits. Mucous membranes were slightly dry. Abdominal exam was benign except for mild diffuse tenderness. Skin turgor was normal. What is the best management for this case?
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