Explanation

Diabetes insipidus is a condition that causes excessive urination due to inadequate AVP (antidiuretic hormone). These clients require liberal fluid intake to prevent dehydration, so the nurse should encourage drinking fluids as tolerated.

Fluid restriction would exacerbate dehydration. Furosemide is a diuretic that would worsen fluid loss. Specific gravity monitoring is useful for tracking hydration status but does not address the client's high volume loss.