Hi, my name is Kris and I've tested the SodaStream Fizzi. It's a pretty simple process. First, you need a specific SodaStream bottle. Just fill it up with some water to simply put it into the machine. It fits in, locks in. Then you press the button on top here one to three times depending on how much fizzy or bubbles that you want in it. Then simply just remove it. You can hear the gas in there and the bubbles start to come out. You can add the SodaStream soda flavorings. The bottles, nice and portable. It has a nice seal on it. It keeps the bubbles inside. I definitely would recommend SodaStream Fizzi to somebody. It's a very portable unit. You can take it anywhere you want with you. It doesn't require anything extra to operate it