A 28-year-old male presents to the emergency department with a 6-hour history of severe abdominal pain, vomiting, and blurred vision after consuming a bottle of homemade liquor at a local gathering in rural Maharashtra. On examination, he is confused, has a respiratory rate of 28/min with deep breathing, and his breath smells fruity. Arterial blood gas shows pH 7.22, HCO₃⁻ 12 mEq/L, and PaCO₂ 28 mmHg. Serum osmolality is 320 mOsm/kg (normal 280–295). What is the most likely diagnosis?