A previously healthy 32-year-old female presents to the ED with a 5-day history of cough and fever. Chest x-ray shows a right lower lobe pneumonia. Her vitals are: BP 108/90, HR 95, SpO2 97% RA, RR 20, Temp 38.8˚C. She is tolerating oral intake. Which of the following is the MOST appropriate next step?