To start off the plant:
In a jar, mix together4g active dried yeast (or 14g/0.5oz fresh)
3/4 pint of water
2tsp ginger 2tsp sugar Leave for 24 hours, then feed the plant with 1tsp root ginger and 1tsp sugar daily. After a week, mix thoroughly and strain into a jug.
To make one bottle (approx 2 1/2 pints):
Dissolve 170g sugar into half a pint of hot water.
Add the juice of half a lemon and a quarter of the strained mixture.
Add 1.25 pints of lukewarm water and stir well.
Decant into a bottle and mature for another week. The bottle may need burping as a lot of gas will build up.
(This next part is speculative as I've not bottled up my second batch yet)
Put the remainder of the strained liquid back into the jar and top up with warm water to replace what you've taken out, and start feeding again with 1tsp sugar daily. The ginger may not need topping up.
A week later repeat the bottling process.
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I've already got my next drink experiment planned. I've just been out harvesting elderberries!