Binary modding a water dispenser to save me from pressing a button

A few months ago, I decided that it’s time I started to become more responsible and to start drinking more water. Unfortunately, the tap water where I live has a very high calcium content, which makes it a lot better when filtered and cooled first. To solve both issues, I picked up a second-hand professional water dispenser:

ION 900 series water dispenser

This thing is amazing. It’s connected to the water supply, has power save features when it detects it’s in the dark for a while, the filter lasts for years, …

Along with the cooler, I also bought thermally-isolated 1L bottles, which take about 50 seconds to fill. Unfortunately, you have to keep pressing the “dispense cold water”-button while filling 😑.

Since I’m lazy and not very rational in my decision making, I decided it’s time to fix that!