WaterMinder was downloaded and installed by over 100K users and the most recent stable release was on Sep 23, 2020. Pay attention to the important detail: adverts are a part of the tool and it offers in-app purchases. This application is often downloaded by Huawei and HTC users.
Get the latest .apk file of WaterMinder 2.3 for free and check out users' reviews on Droid Informer. You will need 17 MB of free disk space to install the app that is built for Android 5.0 and above.
Users write reviews stating that you can get such a benefit of the app as a nice UI.