Take 2~3 grams (a small spoon) of baking soda and put it in an empty mineral water bottle, then fill it up with cool water or pure water (about 500 milliliters), dissolve it and shake it well and then you can drink it.

The soda water made in this way has a bitter taste, the taste is not very good. You can add the right amount of sugar to dilute the bitter flavor of baking soda. Soda foam can improve the taste, you can add a small amount of citric acid in the made soda (can also be used instead of white vinegar), sealed and shaken well, in order to dissolve carbon dioxide in the water. The taste is also greatly improved when refrigerated. Drink one bottle a day, which can be divided into several drinks, and cover the lid after each drink, otherwise the gas runs off and the taste is even worse.

Can add lemon slices to improve the taste. Summer with ice is a very good cold drink.