This is a randomized controlled trial that tests whether a program designed to maintain a high fluid intake decreases kidney stone recurrence. Patients 12 years of age or older who have had a kidney stone in the last 3 years may be eligible.

We know very little about how the bladder to brain connections work in children. The most common thing we hear from children who are having urinary leakage is "I was not aware my bladder was full." Is this full bladder message getting lost? In this study we will measure brain wave activity non invasively after you have drank some Gatorade to get a full bladder and after you have voided. The total time needed for this study will be about 3 to 4 hours.