Which is false regarding fluid intake guidelines?

One common misconception regarding fluid intake guidelines is that everyone needs to drink eight 8-ounce glasses of water per day, known as the "8x8 rule." This is false because individual hydration needs vary based on factors such as age, weight, activity level, and climate. Additionally, fluids can be obtained from various sources, including food and other beverages, not just water. Thus, personalized hydration recommendations are more accurate than a one-size-fits-all approach.