I would argue that a mostly vegetarian diet is healthier also. One problem is that it takes some degree of skill to cook a delicious vegetarian meal, but is fairly easy to make a tasty meal out of meat.
We can water our lawns less, and take showers once a week. It will not make much of a difference until we eat less meat. Same goes for sea food too. We are literally eating some of the fish species to extinction - it is just sad.
If agriculture receives almost no restrictions on water use from the state while residential use is slashed, it puts the burden on the people with the least impact. Sure, go around and cite people for watering their lawns and washing their cars, but I'm paying through the nose for water that was imported across state lines and they're planning to implement toilet-to-tap while the corporate farmers are sucking up the groundwater and using it to grow cash crops for export.