Calculating how much water you need to drink daily can significantly impact your overall health, and it often depends on your body size. A general guideline is to drink around 30 to 35 millilitres of water for every kilogram of body weight. For instance, if you weigh 70 kilograms, you should aim for approximately 2.1 to 2.45 litres of water each day.

However, individual needs can vary based on factors such as activity level, climate, and overall health. Engaging in vigorous exercise or spending time in a hot environment increases your hydration requirements. Additionally, consuming caffeinated beverages or alcohol can lead to dehydration, necessitating an increase in your daily water intake. It's essential to listen to your body—thirst is a good indicator of your hydration needs. Always consider adjusting your intake during particularly active days or in warm weather to ensure you remain adequately hydrated.