Wow there is alot of buts on what flavor not to use.. Seems ok with the diet Pepsi's and guessing Coca Cola also which is good with me..These keto people say you don't get 60L from a SodaStreem canister, only 20L but they have a good idea in using a larger refillable co2 tank.
Nicest thing is not have lots of empty cans or bottles pile up.