When you eat, you use up every drop of water your food required to grow. And depending on your choices—roasted broccoli versus a juicy steak—a meal might consume a few liters of water, or a few hundred. Some plants sip gingerly from the soil, while others gulp; and animals not only drink water, but ingest it indirectly through the feed they eat. In a thirsty world, we should choose our foods wisely. To help, Popular Science calculated how many liters of water go into 100 calories' worth of the following staples.