As others have said, most of these are based off the amount of water used to grow the crops. When you see these numbers for meat, it is mostly the water to grow the plants used to feed the animals. Non-organic products is mostly the water actually used in the process of making said item.
Of note, cotton is a very water intensive crop. It’s also a CO2 intensive crop. Even more so when produced organically.
So in all of these water usage questions, the process of production needs to be considered
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