People's preferences haven't changed. Beef continues to be very popular, as do public fountains. The choice not to consume meat (at least here) is mostly associated with pretentious, upperclass people who like yoga and are keenly interested in social justice (there is even a word for this type of person: fresas, which literally means strawberries but here means, well, that type of person).
Eating or not eating meat is more about adopting cultural, class, and identity signifiers than any real correlation with the local water situation.