The purpose of this study is to clarify the fundamental processes underlying behavior change, maintenance, and adherence during and after a 3-month fluid intake intervention period.

The study is a six-month ecological momentary assessment study of patients using the mini-sipIT intervention for 3 months, with weekly assessments of motivation and life events or stressors that disrupt routines during the 3-month intervention period, and monthly assessments of motivation and life events or stressors that disrupt routines in the three months following the end of intervention (months 4-6). The mini-sipIT intervention includes automated and manual tracking of fluid intake and lapse-contingent reminders to drink.

Inclusion Criteria:

• Previous diagnosis of symptomatic kidney stone in the past 5 years,
• Age 18 or older,
• Own an iOS or Android smart phone,
• Proficient in English,
• Capable of providing informed consent,
• Willing to use the water bottle and companion app & receive text message reminders for 3 months,
• Live in continental US.

Exclusion Criteria:

• Pregnant or planning to become pregnant during the next 6 months,
• Concurrently participating in other study involving fluid intake or diet,
• Plan to have surgery in the next 6 months,
• Co-morbidities that preclude high fluid intake (congestive heart failure, end-stage renal disease, chronic hyponatremia), or
• Active medical treatments that would impair protocol compliance.