Sodastream Classics Diet Cola 5 "Keep the bubbles coming" eddie o'donnell 07 February 2018 An easy way to keep the bubbles coming. Practical and economical. As a diabetic my wife is always thirsty and tends to drink a lot of sugar free fizzy drinks to relieve her thirst. Using a soda stream means that we can have a range of drinks always available without ever wasting any because of bottles going flat. Diet cola is a standby go to drink and so we tend to buy it in bulk to ensure we can always make sure that we have plenty of bubbles.