A 5-month-old previously healthy infant presents in winter with 2 days of coryza, cough, and increasing work of breathing. Examination shows tachypnoea, subcostal indrawing, diffuse crackles, and wheeze. Oxygen saturation is 93 percent on room air, and feeding is adequate. According to the Canadian Paediatric Society bronchiolitis guideline, what is the most appropriate management strategy?