A 35-year-old otherwise healthy man presents with a 5-day history of fever, cough, pleuritic chest pain and breathlessness. He has a temperature of 38.5 °C, respiratory rate 22 breaths/min, BP 120/75 mmHg and oxygen saturation 95% on room air. Chest X-ray shows a right lower lobe consolidation. He has no significant comorbidities and can be managed as an outpatient. According to Australian antibiotic guidelines, what is the most appropriate oral empirical therapy?