Best practice for rendering a smoothie bottle

Hi, I designed the bottle in Shapr3d on the ipad. Exporting as STL and importing in Adobe Dimension works perfectly.

But I am not really satisfied with the rendering.

First question: What is best practice for objects like a smoothie bottle (this fruit veggie juice), do I need to design two bodies, one for the bottle, one for the liquid. I tried that but it does not really work. 

Second question: What is the best material for a smoothie liquid, I tried glass that looks OK, also water but all not really. Any tips?

Thanks

Tristan