I bought these even though I do not have a Soda Stream machine as it appeared that the caps could be used with any carbonated water. The box I bought had four different flavours including Lemonade. I had to fiddle with the caps to use them with generic water bottles but I was able to do so and this allowed me to control the radio of the flavouring to amount of carbonated water. Quite tasty and I would likely buy this again. It will be great for the summer.