system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does soda that is bottled taste different than the same soda out of a fountain?
gpt
Because fountain soda and bottled soda often have different formulations. Diet Coke for instance is sweetened with aspartame in cans and bottles, but the fountain syrup also has saccharin because it has a longer shelf life than aspartame.