Geez I'll take a stab at answering your question.
RBHdesign makes a lot of vapor barrier gear, including socks. I use the socks.
But, vapor barrier is not going to make your feet dry--quite the opposite. Basically, they will make them sweat to a point and create a microclimate that allows them to stop sweating and stay warm. It can take some getting used to, but it does work.
You can replicate it for a test run with the bread bags. I got caught in a several inch snow storm with short boots a few years ago and had bread bags for the emergency. They worked fine to keep my feet warm in the walkout, even tho my boots got soaked.
Good luck!