Well, I tried to follow a very simple recipe from "Cooking for Geeks" for Ginger Lemon Soda.
I made a simple ginger syrup by cooking ~200g of chopped ginger together with 2 cups of sugar, then I used half of that syrup together with 1/2 a teaspoon of yeast (from the local home-brew store), and topped off with 900 ml of water.
The recipe says: Let rest at room temperature for two days, then refrigerate and drink.
Well, for the first batch, I had so much pressure that when I opened it, it came out like champagne and I lost half of the soda.
For the second batch, I put it in the fridge after one day. Now the level of carbonation is just right, but it's still a bit alcoholic. I had half a glass and I can definitely tell that there was some alcohol involved.
I wonder: What is the way to go to get nice sparkling soda that isn't also high in alcohol?