A 6-month-old boy presents with a 2-day history of rhinorrhoea, cough and increasing work of breathing. He has subcostal indrawing and diffuse wheeze and crackles on auscultation, but maintains oxygen saturation of 95% on room air and is feeding adequately. He has no significant past medical history. According to the Canadian Paediatric Society guideline on bronchiolitis, what is the most appropriate management?