The spoken version
Say the statement and raise your voice at the end. That is the whole mechanism.
Kamu suka kopi. ‘You like coffee.’
Kamu suka kopi? ‘Do you like coffee?’
No word is added, nothing moves. This is how almost every yes-or-no question is asked in speech.
The written marker
Apakah placed at the front makes the question explicit.
Apakah kamu suka kopi? ‘Do you like coffee?’
It is correct, and it belongs to writing, forms, formal speeches and textbooks. Using it in a warung sounds like reading aloud from a document. This is one of the clearest places where the textbook and the street diverge.
What the book says: Apakah Anda mau minum sesuatu? What you’ll hear: Mau minum?
Notice that the spoken version also drops the pronoun entirely. Indonesian omits anything the situation already makes obvious.
The tag question
Stick kan on the end to check something you already believe.
Enak, kan? ‘Tasty, isn’t it?’
Kamu dari Prancis, kan? ‘You’re from France, right?’
Kan is a shortened bukan, and you will hear it constantly.
Answering
Ya or iya for yes. For no, the answer depends on what was asked: tidak for verbs and adjectives,
bukan for nouns, belum for things that have not happened yet. That distinction has its own lesson,
and it is worth going back to if the three-way split is not automatic yet.