2...Kc6 moves your king unnecessarily and loses you the right to castle for no compensation.
2...g6 is playable but probably a bit premature at this point, although I never play the Sicilian as black so I might be wrong there.
2...e6 is definitely ok as is 2...d6 either of which will lead you into many standard Sicilian Defences.
However, if you are intending to play 1...c5 against 1.e4 then I would suggest you get a good book on the defence, one written from black's perspective, and study it thoroughly.