Most of the time you get thoese dots in when your using radiosity when the hrdi image you are using has lots of white in it. You can try and fix this by bluring the image or by turing on HRD exposure.
And a tip when you are doing liquids that are inside of glass make use you make the liquid smaller than the glass that is going to contain it. If you dont do this you can some time get weird renders since you have to objects on the same plane and when lightwave renders it, it does not know what surface to use.
Hope this helps.
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