Seltzer water is a type of carbonated water that is artificially carbonated and contains no ingredients other than water and carbon dioxide. It is a refreshing beverage and a good alternative to sugary soft drinks. Seltzer water is hydrating and can count towards the daily recommended intake of water. In fact, one study found that sparkling water was as hydrating as still water. However, some types of carbonated water, such as club soda and tonic water, have added minerals and sugar or high-fructose corn syrup. Flavored seltzer water contains natural or artificial flavorings. While these flavorings are generally safe, some people may be sensitive to them. Additionally, some people are concerned that carbonated water may have a negative impact on dental, digestive, or bone health, but there is no evidence to support these claims. Overall, seltzer water is a healthy and hydrating beverage choice, especially when compared to sugary soft drinks.