A 4-month-old previously healthy infant presents in January with 2 days of cough, rhinorrhoea and increased work of breathing. He has mild subcostal indrawing and oxygen saturation of 93% on room air. Auscultation reveals diffuse crackles and wheeze. He is feeding slightly less but has adequate urine output. According to Canadian Paediatric Society bronchiolitis guidance, what is the most appropriate management?