Hi, I am looking for a way to earn some money without invest(because I am broke), I can dedicate 2 hours a day in that. what can I do to make a bitcoin per month without any investment?
you cannot earn money without investing,if earning money is a very easy deal then everyone in bitcointalk would have being millionaires ,nothing can be achieved without doing anything,if you have any technical skills you could earn money or just go for a regular job and convert those to bitcoin 
agree But the other way is If you have skills in programming or making website You don't need to invest bitcoin just search a website that is paying bitcoin and free to register .