<s>[INST] A 15-year-old girl is referred to a pediatrician for a 3-day history of watery diarrhea and vomiting. She is otherwise healthy and takes no medications. Her symptoms started 5 days after returning from a 1-week-long summer camp. She reports feeling feverish and having abdominal cramps. She has not traveled internationally. Physical examination is notable for mild dehydration. 

What is the most appropriate initial management of this patient?[/INST]