Water Intervention for Thinking in Kids (WITiKids ) Study

Inclusion Criteria: 1. Parental/guardian consent 2. Normal or corrected-to-normal vision based on the minimal 20/20 standard in order to complete the cognitive task (below 20/20 vision). Exclusion Criteria: 1. Participants younger than 9 years and older than 10 years at the time of testing age. 2. Prior diagnosis of cognitive or physical disability, including ADHD (severe asthma, epilepsy, chronic kidney disease, and dependence upon a wheelchair/walking aid). 3. Use of anti-psychotic, anti-depressant, anti-anxiety medication, as well as those medications used for ADD/ADHD (use of any anti-psychotic, anti-depressant, anti-anxiety, and ADD/ADHD medications). 4. Participants must have not yet reached, or be in the earliest stages, of puberty, as measured by a modified test of the Tanner Staging System 5. IQ below 85 6. Use of medications that alter urinary excretion and water metabolism 7. Use of internal electronic device, such as a pacemaker