It's pretty easy to knock something up.
I make Ginger beer for the kids, which I keg. But previously (and as a kid) we made it fermented for carbonation.
You can just make it to taste, and given ginger can be a bit 'bitey', maybe this is a good idea.
I would always include: ginger, sugar, lemon (juice & rind).
My recipe says:
4 lemons
5 cups of sugar
10 teaspoons of ground ginger
32 cups of water
But it's very rough, for example - how big is a lemon?!
Do *not* leave out the lemon. Unless you really hate lemon.
Boil these together. Use dried & powdered ginger if you like, or fresh.
Make a small batch, probably a bit sweeter than you think. Then cool and taste it. The colder things are, less able you are to perceive food flavours.
If it tastes good, make a bigger batch, and put it in some PET bottles with a bit of yeast (it doesn't matter a big lot on type, even bread yeast works OK).
Leave the bottles out at room temp, but cop a feel every day. Once they go hard, they're ready, and get them in the 'fridge.
If you have glass bottles, just make one in PET, and feel that. Obviously anything fermented has at least a small amount of alcohol. So if you're pregnant, make it with direct carbonation.
Another recipe I've read, but have not made (but it comes from a respected source) is to substitute honey for half the sugar.
I don't really like honey much though.
Normal brewing practices are used WRT sanitation, and bottle filling, etc. etc.