I thought I was late with this but I see people still submitting, I uploaded this originally on Friday, and thought I was late but saw it appear in the challenge list, well may as well post here too.
Wanted to focus my entry on the potion itself rather then the bottle or scene.
Using a variety of effects here, the milky/shifting liquid effect is using something I made before, which is placed inside a simple gradient liquid layer.
The bubbles rising to give the impression of vigor in the potion, additional bubbles breaking on the surface to give the impression of a slow simmer/boil
Inside the top of the bottle is nestled two layers using an alpha noise texture to give the impression of vapor at the top of the bottle, both layers are rotating slowly in the opposite direction as each other.
There is a very very slight caustic effect on the ground to give the impression that the moving liquid is emitting light onto the ground, this is done with two alpha textures rotating in the opposite direction as each other.
The label is using slight bit of dithered opacity to make it a bit translucent so the light and motion of the liquid can be seen through the label ever so slightly.
Best viewed in fullscreen mode. Probably not ideal for mobile devices.