A 58-year-old man with hypertension and chronic kidney disease (eGFR 35 mL/min/1.73m²) presents with ankle edema and dyspnea on exertion. His current medications include lisinopril and amlodipine. On examination, BP is 158/96 mmHg, JVP elevated, and bilateral ankle edema present. Serum K⁺ is 5.8 mEq/L, Na⁺ is 138 mEq/L, and Cr is 2.1 mg/dL. Which diuretic is most appropriate to initiate for fluid overload management in this patient?