Startup Idea: Hydration Reminder Software

Startup idea to develop a non-intrusive software that reminds users to drink water every 10 minutes. The software must be customizable in terms of reminder intervals, and should be discreet to avoid causing disturbance to others. Users express a willingness to pay for such a software.

I have a problem remembering to get all the water in that I need to get in. If I had software installed on my machine reminding me to drink about every 10 minutes would be a great reminder. If I set up the timer that would be great as well. Also I would the reminder to not be too intrusive since I don't want my office mates to go crazy hearing the reminder that often. I would pay for software like this. I would be willing to pay around $5.