SUNDAY, July 10 (HealthDay News) -- Drinking and water sports are highlights of summer fun for many Americans, but mixing the two can be hazardous, the National Institute on Alcohol Abuse and Alcoholism warns. Alcohol is involved in half of all water recreation-related deaths of teens and adults, according to the NIAAA, which outlined a number of potentially dangerous scenarios: Alcohol can impair swimmers' judgment and increase their risk-taking. For example, swimmers may go out farther than they should and be unable to make it back to shore, or they may not notice how cold they're getting and develop hypothermia....