It’s crisp, zesty, and balanced—basically ... I pour in equal parts lemon-lime soda and soda water, gently so I don’t lose the fizz. The combo keeps it bubbly but not overly sweet.

Have you ever noticed that when you put a straw in soda pop, the straw gets covered with bubbles? The bubbles are made from a gas called carbon dioxide. The soda pop company puts the carbon dioxide in ...