A 6-month-old infant presents with a 3-day history of cough, rhinorrhoea, and increasing work of breathing. She has subcostal indrawing, RR 50 breaths/min, and SpO2 93% on room air. Auscultation reveals diffuse crackles and wheeze. She is feeding slightly less but is not dehydrated. According to the Canadian Paediatric Society bronchiolitis guideline, what is the most appropriate management?