Water is vital to life and without it we would not survive much longer than a few days. Find a research article (from a research journal) that studied the effects of inadequate water consumption on the body. This can include research on athletes and/or non-athletes. 

Muckelbauer, R., Sarganas, G., Grüneis, A., & Müller-Nordhorn, J. (2013). Association between water consumption and body weight outcomes: a systematic review. The American journal of clinical nutrition, 98(2), 282-299. https://academic.oup.com/ajcn/article-abstract/98/2/282/4577135

Step-by-step explanation

Article cretique

Drinking enough of water is widely thought to aid in weight reduction or maintenance attempts and has become a widely utilized weight management technique. According to a recent recommendation system in the United States, plain water is the preferable beverage for meeting daily water demands. Water consumption has also been recommended in some popular weight-loss programs.
The article demonstrates that drinking lots of water is a common weight-loss strategy; 30% of all persons in the United States who attempted to lose weight indicated that they drank a lot of water.
The research adds that since tap water is readily available and inexpensive, a suggestion to boost water intake to avoid overweight and obesity may become a public health priority. Tap water should be promoted as the primary water source, particularly in nations where drinking water from the tap is safe and appealing. In nations where tap water is still potentially polluted, attention should be given to the supply of clean drinking water.