This simple project refills 125ml of water on my water cup (if present) every hour, this way I can make sure I drink 1L of water during my workday (8 hours).
I connected a water pump to an arduino (uno) and added a timer in the code. I added a infrared sensor to ensure there is a cup present before pouring water.
I reused a milk dispenser from my coffee machine to case everything and place it on my desktop.
Every morning when I arrive to my home office, I place a cup on the water dispenser, and it will automatically start adding water every hour.