However, you will find that most first world airlines have very stringent quality assurance and control programs. Regularly we carry water samples from outstations. These are tested for a entire range of nasties. The food and drink we serve is tested before, during and after preparation. Everything we serve with on board is also tested. And then you have the taste test. In my opinion, our passenger and crew food is palatable. Much of the passenger food is pretty good and all of it included in the fare, including the drink. As for what we serve that is set by the marketing and customer services people. The controlling factors are flight time and ticket class - there is no controlling legislation.
PM