A 48-year-old otherwise healthy man presents with a 3-day history of fever, productive cough and right-sided pleuritic chest pain. He is febrile at 38.5°C, respiratory rate 22 breaths/min, blood pressure 122/76 mmHg and oxygen saturation 95% on room air. Chest auscultation reveals crackles at the right base and chest radiography confirms right lower lobe pneumonia. He has no significant comorbidities. According to Canadian community-acquired pneumonia treatment guidance, which is the most appropriate empirical outpatient antibiotic regimen?