Water is your body’s principal chemical component and makes up about 50% to 70% of your body weight. Your body depends on water to survive.

Every cell, tissue and organ in your body needs water to work properly. For example, water:

• Gets rid of wastes through urination, perspiration and bowel movements
• Keeps your temperature normal
• Lubricates and cushions joints
• Protects sensitive tissues

Lack of water can lead to dehydration — a condition that occurs when you don’t have enough water in your body to carry out normal functions. Even mild dehydration can drain your energy and make you tired.

How much water do you need?

Every day you lose water through your breath, perspiration, urine and bowel movements. For your body to function properly, you must replenish its water supply by consuming beverages and foods that contain water.

So how much fluid does the average, healthy adult living in a temperate climate need? The U.S. National Academies of Sciences, Engineering, and Medicine determined that an adequate daily fluid intake is:

• About 15.5 cups (3.7 liters) of fluids a day for men
• About 11.5 cups (2.7 liters) of fluids a day for women

These recommendations cover fluids from water, other beverages and food. About 20% of daily fluid intake usually comes from food and the rest from drinks.

Is water the only option for staying hydrated?

No. You don’t need to rely only on water to meet your fluid needs. What you eat also provides a significant portion. For example, many fruits and vegetables, such as watermelon and spinach, are almost 100% water by weight.

In addition, beverages such as milk, juice and herbal teas are composed mostly of water. Even caffeinated drinks — such as coffee and soda — can contribute to your daily water intake. But go easy on sugar-sweetened drinks. Regular soda, energy or sports drinks, and other sweet drinks usually contain a lot of added sugar, which may provide more calories than needed.

How do I know if I’m drinking enough?

Your fluid intake is probably adequate if:

• You rarely feel thirsty
• Your urine is colorless or light yellow

Your doctor or dietitian can help you determine the amount of water that’s right for you every day.

To prevent dehydration and make sure your body has the fluids it needs, make water your beverage of choice. It’s a good idea to drink a glass of water:

• With each meal and between meals
• Before, during and after exercise
• If you feel thirsty

Source: https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/water/art-20044256