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How to liquidize an object with photoshop 
Click here to download the sample image and then open it in photoshop. 
Unlock the background layer: double click on the " background " layer and named it " glasses ". Then create a new layer under " glasses " layer, name it " background " and fill it with white color.
Using the eyedropper tool to get a color sample from the bottom part of the glasses. Select the pen tool in the shape layers mode and draw some falling drops on the bottom part of the glasses.