How much water should I drink a day in oz?
                                
                                
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                                    4 min read                                
                            
                                According to the British Nutrition Foundation, the average adult human body is composed of about 60% water. Knowing how much water should I drink a day in oz is a crucial step toward maintaining proper hydration, which is vital for every system in your body to function properly. This personalized figure is more complex than the traditional '8 glasses a day' rule, varying significantly based on individual factors like activity level, climate, and overall health.