2900 calories
A regular bath is 150L of water, you need enough water to fill 100 baths to produce 1kg of beef
Chicken is at just over a quarter in water needs while tofu is at a sixth of beef in water needs. 1650 calories for chicken, 830 calories for tofu, so chicken has the best water/calories ratio…
About 25% for beef vs 20% for chicken, give or take