Final answer:
The IOM suggests that individuals aged 70+ should aim for an Adequate Intake (AI) of water at 2.7 liters (11 cups) daily, including the water content from solid foods.
Step-by-step explanation:
For individuals aged 70+, the Food and Nutrition Board of the Institute of Medicine (IOM) suggests an Adequate Intake (AI) for water similar to adult females, which is 2.7 liters (11 cups) daily. However, the actual consumption of water does not need to be from water alone, as about 20 percent of dietary water comes from solid foods. Given their physiological changes and potential health issues, older adults should ensure adequate water intake to maintain health and prevent hydration-related complications. It's important to consider individual needs, as some circumstances may necessitate adjustments to this recommendation.