A 32-year-old man from rural Bihar presents with jaundice, dark urine, and abdominal pain for 5 days. He reports consuming contaminated water 3 weeks ago. On examination: icterus, hepatomegaly, no ascites. ALT 2800 U/L, AST 2200 U/L, bilirubin 8.2 mg/dL (direct 6.8), INR 1.1, albumin 3.8 g/dL. Anti-HAV IgM is positive. What is the most appropriate next step in management?