A 28-year-old man presents with diabetic ketoacidosis after an influenza-like illness.

Lab values include:
sodium 144 mmol/liter
potassium 5.7 mmol/liter
chloride 98 mmol/liter
sodium bicarbonate 13 mmol/liter
creatinine 1.5 mg/deciliter
BUN 30 mg/deciliter
glucose 702 mg/deciliter

and

venous pH 7.2.

What is the best strategy to support this patient?