Hi, I would like to use the leak sensor SNZB-05P to detect when my coffe machine runs out of water. The plan is to stick it inside the tank and when the water drops under a level to get a notification.
Would this work with this new sensor? Is it ok to keep it in water all the time (IP67) considering that i use the water for coffe 
?
Another idea would be to connect two wires to the exposed terminals of the sensor and submerge the wires.
Anyone have something like this?
Nice idea,
But since that water is meant for drinking, maybe make sure the outer case is safe enough for such usage?
Yes, it can be done. I use a similar solution in a filter jug. It is a factory design. Two electrodes allow you to count the filling cycles and determine how worn the cartridge is. The electrodes are made of copper.
The only thing that puzzles me is the practical issue. Are you sure you want to have wires around the tank? Also, removing the tank to fill it with water can be tricky. You might want to trust your own inbuilt sensors, like your eyes 
Theoretically it should work.
I use a float type sensor to measure water level, but not for coffee.
https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/
Interesting topic. I never remove the tank from my Keurig coffee maker but instead fill it with the dish sprayer hose on my sink. Consequently, the switch under the tank, which I assume works by weight, has become stuck such that it doesn’t detect low water. 
These sensors are normally just electrical contact sensors. I don’t have that leak sensor but the one I do can be activated with a metal pair of scissors. I would just drill little holes through the water tank for two metal electrodes and then seal them in place with kitchen grade silicon, thereby obviating any concerns about poisoning and I think IP ratings usually contain a time limit, but it’s been a while since I read them.