How to create "form" from "model" with 2 foreign keys?

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Context: I'm new to Django. I've just completed the tutorial on the Docs page. I'm trying to make a coffee ordering application. Basically a person has to enter his details and select coffee along with number of cups.

Now a person may select 2 or 3 of the same type of coffee, or he may select multiple coffee types.

I've attached my models.py file. How do i make a form for this mode?