I did not make this. Don't remember who the original creator is. I just adapted it to work with TDA based models (90% of what people use in VRC) and animated it.
Package comes with a prefab that includes an animated mesh which will fit most MMD models' faces.
You can always fit it to your model's face in Blender or your 3D modelling program of choice if you have a unique model.
The material is not of much importance. It comes with a Poiyomi's Master Shader material but it looks pretty good with a liquid shader as well.
It should work out of the box basically. Just position and resize it until it fits your model's face and the blend shape(s) that you'd like to use it with. It generally looks best with the facial expression that is shown in the images above.
It has one blend shape that controls the drool coming to the front of the face and the tears rolling down the cheeks. You can remove the animator component and simply use it as better than default tears if you'd like (since the animator is what forces the tears to move and the drool to surface).
GIF Example:
https://gyazo.com/e29905bf5e111d9b566db881017bcf17
Enjoy.
