I also bought an adapter, online, that allows me to use refillable CO2 cans, at $3 per refill, instead of the $25+ that SodaStream charges. With that, SodaStream is a lot cheaper than the regular sodas.
Aspartame is harmful? To believe that you'd also have to believe that a banana is harmful....or a small piece of grilled chicken with a glass of apple juice/tomato juice/red wine.
The only reason that Coke puts salt in their sodas is to make you thirsty.
Do you really think that just 35 mg. of sodium in a 12 oz. coke can make you thirsty? Please. The reason there's sodium in coke is because they use carbonated water, not pure water. If you want water without sodium, you'd have to distill it, and no beverage company is going to add that cost to their process. Flavor manufacturing utilizes a water process, so the flavoring will also contribute to the sodium content.
Everything in food isn't a conspiracy, even though the crazies at CSPI may say otherwise.