I cook everyday and there is absolutely no way that a normal family yet a single person would be using 20l of water per day to cook, unless they were deliberately aiming to use as much water as possible. Including washing dishes etc.

The example stated for farming is 2000 liters per person per day for food. I'd like you to pause for a moment and think about that statement. A person can't eat a whole head of cabbage in a day, and you're saying that this head of cabbage would need more than two tons of water per day before it's harvested.

Likewise with the washing machine, you're talking about washing a full load per person every day. Who do you know that soils so much his clothes that he needs to wash a full load only for him every day?

Water to grow the grass for beef cattle is rain, as I assume at least a small minority of people reading here will know.

Your original comment is greatly upvoted and the people here actually believe that two tons of water per day per person is needed to grow their food. Per day. Per Person. I can't fathom what is going on in this forum.