For me a drinking reminder is pretty important as I don’t feel thirst at all. The first thing I feel is a headache and after that I feel nauseated, if I somehow don’t drink at all during the day.
I use WaterMinder for iOS and I do try to also track my drinking with it but I always get lazy with it.
I have a Zero with a macropad attached. Key presses are then sent to Home Assistant through MQTT. The zero is perfect for it, small and low power.
Still wondering what to actually do with my Zero 2.