A client who reports frequent and increased urination is diagnosed with diabetes insipidus. The electrolyte report of the client is as follows: sodium, 150 mEq/L; potassium, 4.5 mEq/L; calcium, 5.2 mEq/L; and chloride, 96 mEq/L. The health care provider orders diet modification accordingly. What dietary restriction will be recommended for this client?