I don't care about analyzing the data afterwards. When I open the notebook and see that I've only had one glass of water, it motivates me to drink another, until I get around 8 in one day.

I've read https://writings.stephenwolfram.com/2012/03/the-personal-ana..., have used Seinfeld calendar apps, and bought productivity tools... all with no luck.

I have an addictive personality so I could easily sit in front of the computer and write code for days on end and not take care of myself. This little physical book and pen is the only thing that's brought me back to reality and kept me on track!