A 5-month-old previously healthy infant presents with 2 days of cough, rhinorrhoea, tachypnoea, and poor feeding. Oxygen saturation is 94 percent on room air, respiratory rate 48 breaths per minute, and auscultation reveals diffuse crackles and wheeze. He has mild subcostal indrawing but is feeding adequately. According to Canadian Paediatric Society guidance on bronchiolitis, what is the most appropriate management?