It is easy to make soda by adding sugar and yeast to a bottle of water and closing it tightly. However, checking different recipes, I did not get what is the best condition for this. I have a couple of tiny questions to find the optimum treatment.
I added 1/2 tsp instant yeast (baking yeast) and 1 tsp sugar to 2 l of water.
- Should the bottle left untouched, or it is useful to shake it occasionally?
- To keep it warm, is it good to put it in sunshine, or a dark place is better for it?
- Leaving air in the bottle or filling it completely?