A 3-month-old previously healthy male infant presents in January with 2 days of rhinorrhoea, cough, and increasing work of breathing. He is feeding slightly less but has normal urine output. Respiratory rate is 52/min, oxygen saturation 95 percent on room air, and he has mild subcostal indrawing with diffuse crackles and wheeze. According to Canadian paediatric bronchiolitis guidance, what is the most appropriate management?