A 66-year-old woman presents to the emergency department with loose, watery stools for 3 days, after completing a 10-day course of oral antibiotics for a sinus infection. The patient denies nausea or vomiting. A stool sample is positive for Clostridioides difficile toxin. Examination reveals soft, nondistended, and mild lower abdominal tenderness. The best next step in management is:

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