Final answer:
The nurse should explain that the client can have 8 glasses or cups of fluid each day to stay within their fluid restriction.
Step-by-step explanation:
The nurse should respond to the client's question by explaining that they are on a fluid restriction of 2,000 mL/day. The nurse can provide examples to help the client understand the appropriate amount of fluid intake. For example, the nurse can say that each glass contains 8 ounces, which is equivalent to 240 mL. Therefore, the client can have a total of 8 glasses or cups of fluid each day to stay within their fluid restriction.