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Terrific features are available, very flexible. My one gripe is that if there is documentation defining temperate/cold/... weather and etc. more specifically (in the suggested daily goal section), I haven't found it, and it would be helpful! But I was quickly and easily convinced to spend $10 and haven't regretted it - it's proven a fun way to encourage me to stay on top of my hydration issues. Lots of options for keeping track of different things one drinks (and options to edit or expand the list), with corresponding rates of relative hydration, for example (like I said, flexible :) )