For years, I had been drinking water on a regular basis, but with this being my second water tracking app, this one has proven to be extremely useful. Because of its ease of use, whether on the iPhone or the Watch, that is why Ive been using it. Also, the UI is very streamlined, and we (the end users) can easily use it to track not just water, but other types of beverages too, such as juice, milk, and more.
Best of all, when I first started using it, I saw that it had some "starter" literature that gave detailed accounts of why we should drink water, which made me use it all the more. As a result, Im using this every time that I drink something. Now, if Apple could modify their "Water" setting in the Health app to show other beverages you are drinking (instead of all your liquids, no matter what type they are, ending up under the Water category!), then we will have a more complete picture of our health. Other than that, this app is definitely useful in tracking liquid intake!