A 5-month-old infant presents with 3 days of cough, nasal congestion, and increasing work of breathing. Vitals: T 100.2 F, HR 150, RR 50, SpO2 93% on room air. On exam there are diffuse wheezes and crackles; CXR shows peribronchial cuffing without focal consolidation. He is feeding adequately. What is the most appropriate management?