I ordered (real) Ginger Beer plant culture starter from
Fermented Treasures, and pretty much followed the instructions. It came with a bunch of different recipes (15 of them). The plant comes as dehydrated granules, which you grow in sugar water, until it triples in size. The problem is once you start the culture, you have to keep feeding it to keep it alive (it keeps growing forever). I eventually had to let mine die when I was out of town for an extended period (I thought it would be kind of weird to ask a neighbor to come over to feed my GBP). Most of the recipes that come with the GBP call for powdered ginger, however, my favorite recipe is just freshly ground ginger (in a blender), lemon (with some zest), white and brown sugar and a few peppercorns (I sometimes also add a little ginger powder for extra punch). You can add a little cream of tartar for frothiness. Be sure to use bottled or filtered water (chlorine can kill the GBP). Also, if you use fresh ginger, then be sure to put the Ginger Beer Plant in a muslin cloth bag (you can get them at a brewing store), or else you will never get the culture separated back from the ginger sludge. I made this mistake and it took many hours to separate the GBP from the ginger bits (now I know why the recipes use powdered ginger). Once the plant has grown, it works fast (about 3 days). After a few days of fermenting in the jar, you strain the beer and place it in plastic bottles. Then you need to leave the bottles in the sun for a day, to force carbonation into the beer. At first there is only enough GBP to make about 2 quarts of ginger beer, but the plant keeps growing with time. Be sure to use plastic water bottles to store the ginger beer in, as glass will explode. Also when you open the bottles, make sure you let off the excess co2 first. Although the culture pretty much goes dormant in the fridge, there is still some fermentation going on, so if you store the bottles, periodically loosen the caps to let excess gas escape. I bought some one gallon glass jars with loose fitting lids from Crate and Barrel to make the Ginger Beer in. This time of year, you can just let the jars sit near a window to keep them warm while the beer is fermenting. When I made the stuff in the winter, I placed it at the edge of my mixing board to keep it warm.

The dehydrated starter comes vacuum sealed in a small mylar envelope.

Here is the starter freshly added to sugar water.

The Ginger Beer Plant re-hydrated, re-animated and ready to use.

The ginger beer fermenting on my warm mixing board (an expensive accident waiting to happen).

The final product. I don't have a picture of any poured into a glass, but the resulting beverage is super-carbonated with tiny champagne-like bubbles that are so tiny they feel sharp. When freshly poured, the intense ginger bubbles will make you sneeze. For a real kick you can add a few hot red-pepper seeds to the brew.
http://www.fermentedtreasures.com/gingerbp.html