People often hear that they should drink eight glasses of water per day. However, the amount of water a person should drink can vary depending on their age, activity level, and more. How much water should you drink a day? Most people need about four to six cups of plain water each day. But it may be surprising to learn that water intake is an individualized number. While the daily four-to-six cup rule is for generally healthy people, that amount differs based on how much water they take in from other beverages and food sources. Also, certain health conditions, medications, activity level, and ambient temperature influence total daily water intake. Unfortunately, many of ... Drinking enough water can help you burn fat and increase your energy levels. This page explains exactly how much water you should drink in a day. Drinking eight glasses of water a day – or about two litres – is actually more than our bodies need to stay hydrated, according to the latest research. Instead, you should drink between 1.5 and...