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Explanation: Bok, kako si? If you greet one person, well aquainted. So, this is 2 person, singular.
If you wanna greet more persons or to use polite form then: Bok, kako ste?
You may also say Zdravo, kako si/ste?
But the last is more in Serbo-Croatian than in Croatian.
Especially if you greet person who lives in Zagreb - then: Bok! is almost obvious.
I hope it helps.
If you need transcription ask me. But Croatian is a language with phonetic principles of writing and reading.