A 48-year-old previously well man presents with fever, productive cough and pleuritic chest pain for 3 days. He has a temperature of 38.5 °C, respiratory rate 20 breaths/min, blood pressure 130/80 mmHg and oxygen saturation 96% on room air. Chest examination reveals right lower zone crackles. He has no significant comorbidities and is managed as an outpatient. According to Australian antibiotic guidelines, what is the most appropriate empiric oral antibiotic regimen for this low-severity community-acquired pneumonia?