If you kegging in budget kegs then I remember seeing nitrogen bulbs somewhere that you can inject. If your using cornie kegs then you can buy mixed gas bottles to force carbonate your beer. You will need a smooth flow nozzel for it to be like the pub.
Pubs use a 70/30 mix of nitrogen / co2 which would be quite hard to achieve with bulbs alone. I cant say I have tried it. I am sure someone with more knowledge will let you know.
Bottle conditioning only produces Co2 fizz so no help there