Diet - water; H2O
Some of the water in our body is obtained through foods we eat and some is the byproduct of metabolism. But drinking water is our main, and best, source of water.
We also obtain water through liquid foods and beverages, such as soup, milk, and juices. Alcoholic beverages and beverages containing caffeine (such as coffee, tea, and colas) are not the best choices because they have a diuretic (water-excreting) effect.