It I think recommended for me if bitcoin used as sideline or extra source of income to pay the bill like electricity and water bill.
Well yeah, if you were just earning bitcoins as a part time job then there shouldn't be a problem.
However if you aren't that experienced with bitcoin or you are concerned about bitcoin being too volatile, then sell your bitcoins as soon as you get them. Right now I'd say that earning some bitcoins either from sig campaigns or freelancing is a great idea because of the high bitcoin price right now.
Don't depend on it as a regular source of income.... Just "fun money", for partying etc.