A nurse is assessing a client who is receiving enteral feedings via an NG tube. The client has developed hyperosmolar dehydration. Which of the following actions should the nurse take when administering the client's feedings?

Adding water to the formula is the correct action to take when a client is experiencing hyperosmolar dehydration due to enteral feedings via an NG tube. Hyperosmolar dehydration occurs when there is an imbalance of electrolytes and fluids in the body, leading to increased osmolarity of the blood. By adding water to the formula, the nurse can dilute the formula, reducing its osmolarity. This helps to prevent further dehydration and restore electrolyte balance in the client. Repositioning the NG tube, increasing the rate of formula delivery, or switching to a lactose-free formula do not directly address the issue of hyperosmolar dehydration and may not be effective in resolving the problem. Therefore, adding water to the formula is the most appropriate action in this situation.