A 45-year-old previously healthy man presents with 2 days of fever, productive cough with rusty sputum and right-sided pleuritic chest pain. He is a non-smoker. Vital signs: T 38.5 °C, BP 128/78 mm Hg, HR 96/min, RR 20/min, SpO2 95% on room air. Chest examination reveals crackles over the right lower lobe. CURB-65 score is 0. What is the most appropriate empirical outpatient antibiotic regimen according to CAP guidelines?