Your numbers for beef are absurdly wrong. Reality is closer to 2000 gallons per pound, or roughly 0.5 calories per gallon. Chicken is about 4x less. Grains are

Your numbers for beef are absurdly wrong. Reality is closer to 2000 gallons per pound, or roughly 0.5 calories per gallon. Chicken is about 4x less. Grains are roughly an order of magnitude less. As a country the USA consumes dramatically more meat than necessary, cutting even a little would have a massive impact on water consumption.