A 45-year-old previously well man presents to his GP with a 2-day history of fever, rigors and productive cough with green sputum. Respiratory rate is 22 breaths/min, oxygen saturation 95% on room air, BP 126/78 mmHg and CURB-65 score is 0. Chest auscultation reveals right lower zone crackles. He has no significant comorbidities and is managed in the community. Which empirical oral antibiotic regimen is most appropriate according to Australian guidelines?