A 2-year-old girl presents with a 2-day history of cough, rhinorrhoea and increasing work of breathing. She has tachypnoea, chest wall recession and diffuse wheeze and crackles. Oxygen saturation is 93% on room air. She is feeding less but has good urine output. The clinical picture is consistent with bronchiolitis. According to Australian paediatric guidelines, which management is most appropriate?