Your bottle of beer is already fermented. It won't help.
As the poster above notes, you can make your own starter wort. Target between 1.030 and 1.040 and just mash a small amount of grain. Depending on how hot you keep your water heater, your tap water might do it (not mine, which is around 130 degrees).
2012 Canadian Brewer of the Year
2013 Canadian Brewer of the Year
2015 Canadian Brewer of the Year