Water is essential for life. It makes up about 60% of our body weight and is involved in many important bodily functions, such as regulating body temperature, transporting nutrients, and removing waste. Most people need to drink about 8 glasses of water per day. However, some people may need more or less, depending on their activity level, climate, and health conditions. Drinking plenty of water is one of the best things you can do for your health. A Drink More Water Sticker.