What I want to do but I can’t because I don’t know where to start or how to do it is when you move the glass of water it will move with the fluid it contains inside the container. 
How can I start, or what do I do?
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You probably won’t have much luck doing it with terrain water.
Roblox does not have any built-in way of simulating realistic fluids in real time, trying to implement it yourself would probably make a buggy and laggy mess, and you may not really need it unless you are specifically trying to make a water simulation showcase (in which case, godspeed). You’ll probably want to look into ways to fake it instead, such as by using animations or editable meshes.
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its not possible to make realistic water physics with terrain particles, the closest u can get is create some parts and use Terrain:FillBlock() to fill the area the part is at with water, but even then it flickers and just isnt good enough quality to make it into an actual game:
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Roblox has terrible water, it’s impossible, unless you can somehow make a custom water system.
But Roblox can make it realistic BC Roblox wants to be realistic