Simple data logger, record every time you press the button.
I am trying to track my health, and I'd like to count every time I drink a bottle of water. I would like to see data logging capability, simply tracking when the button was clicked during a day.

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Johan Swetzén commented
I think you can do that with IFTTT: Add a row to a spreadsheet in google drive whenever a flic is clicked. The time can be included, so I think it would fill your need.
What I'm interested in is to log to healthkit, though! Shameless plug: vote for my idea http://ideas.flic.io/forums/283403-flic-ideas/suggestions/18556495-healthkit-integration-for-tracking-activities