A 35-year-old previously healthy man presents to your clinic with a 3-day history of fever, productive cough with rust-coloured sputum and right-sided pleuritic chest pain. He is afebrile in clinic with respiratory rate 18 breaths per minute, oxygen saturation 97 percent on room air and normal blood pressure. Chest examination reveals right lower lobe crackles. CURB-65 score is 0. What is the most appropriate empiric antibiotic choice for outpatient management in Canada?