Step 2: Making the "PLANT"
The basic process of making ginger beer is to grow your yeast culture, called a plant. You then squeeze the juice of the plant into your sugary water, bottle it and let it ferment.
So... to make the plant: you'll need the jar (needs to be able to hold at least 600 ml ~ 20 oz) your ginger powder, some sugar and water and the lemon juice oh and also the yeast.
600 ml water - cold or room temp - if its hot you'll cook and kill your yeast.
1 tsp yeast
2 tsp Ginger powder
4 tsp Sugar - Provides food for the yeast to use and multiply
1/4 cup lemon juice (juice of 2 lemons) - provides an acidic environment that helps prevent other bacteria from taking over.
10 Raisin - not sure what these do, they may provide a source of wild yeasts or they may provide a wider range of sugars to get the yeast started. Either way they're fun to watch because you know your yeast is working if they start floating in a day or two.
stir all of this in the jar, cover the jar with some fabric or a paper towel and place jar in a warm area 75-85 deg F is the best (if it's below 65 ish the yeast will pretty much stop growing, and if it's above 100 they will slow down and at a little hotter they will start to die). A good warm place in winter might be next to your fridge.
Everyday for the next week feed your 'plant' with 2 tsp ginger powder and 4 tsp sugar - stir in, and recover
Within about a week your plant should be ready to use.