Analysis
What the official said
“Most people need about 64 ounces of water each day.”
Claimant: Registered Dietitian, Mountain Home VA Health Care System Registered Dietitian, Mountain Home VA Health Care System
Agency or office: U.S. Department of Veterans Affairs
Context
From a VA News article (Healthy summer eating: Nutritious ways to enjoy the season) offering general hydration and nutrition advice published on the VA website.
Evidence
The 64‑ounce (about 1.9 L) guideline (the "8×8" rule) is a simple heuristic but is lower than the Adequate Intake values used by U.S. authorities and many health organizations. The National Academies’ Dietary Reference Intakes set AI for total water at about 3.7 L (125 oz) per day for adult men and 2.7 L (91 oz) per day for adult women (these amounts include water from all beverages and food). Individual needs vary by age, sex, body size, activity level, health status, and climate; therefore stating a single 64‑ounce requirement for "most people" is oversimplified and can understate recommended intake for many adults.