Get a drinkmate. I have one and got an adapter off ebay that allowed me attach a 40 gallon c02 tank to it that's lasted me several years. You can get the tanks from welding shops, just make sure that you get a food grade tank and fill it with food grade co2. You can also do juices with it unlike the sodastream. Plus it's not attached to the israel/palastine conflict if it matters to you. Sodastream used to have their manufacturing plant in occupied west bank territory until they got boycotted for it.
Like @Stir Fry said, Soda stream is only meant for adding carbonation to water. It doesn't work with anything with particles in it


This adapter should work with drinkmates as well
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Kitchen External Hose Adapter with Filter Kit to CGA320 CO2 Tank for Sodastream | eBay
CGA320 Valve of CO2 Tank(USA, CAN, Brazil, Colombia, Philippines.). 1 x Hose Adapter Kit to CGA320. CO2 Convertor for Sodastream 60L Tr21-4 Threads Cylinder to Quick Connect Soda. CO2 Cylinder Refill Adapter with Ball Valve for Sodastream CO2 Tank Connector.www.ebay.com