A small test image with the corrected settings. What appears to be the 
horizon is in reality the semitransparent bounding box, the camera being 
situated just a tiny bit above it. The mist strands do not touch that 
upper boundary but be aware that their extension upward is controlled by 
the warp{turbulence} of 0.4 for the y-direction. So, it is a bit tricky 
to find the correct values for the density map without the strands 
piercing the container.

Samples may be a bit low as there are some artifacts visible but I 
wouldn't change it as in your scene they would be hidden by the water 
texture.

I have used here a somewhat denser scattering colour and also scattering 
mode 5 which I often prefer, here with excentricity 0.5.

For this small scene, render time was about 30 minutes.

-- 
Thomas

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