How do I make a small puddle of water on the floor?

I just want a small puddle of water like in the “reflections subway” i don´t really understand how i fix it if i apply it to the bricks or it´s something that i just half to add seperatly, please help me.
/Alex

Not my tutorial, but a very nice one
Youtube - Water Shader

Unreal Engine 5 - Water Puddle
Here is a more updated version on the same topic that is applicable for unreal engine 5.

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