I just looked at my water bill, I am at about 150L/person/day, which is about average for my country. It includes drinking, cooking and washing. So less than th

I just looked at my water bill, I am at about 150L/person/day, which is about average for my country. It includes drinking, cooking and washing. So less than then the 200+20+2 estimate but not by that much, if you enjoy baths and lengthy showers, 222L is possible. And from what I've seen 2000L/person/day for agriculture is not too outlandish. The production of your garden is likely to be tiny compared to what you eat. A head of cabbage is maybe 1/10th of you daily calorie needs, and compared to animal products, vegetables have low water requirements. So maybe it is not exactly right, but the orders of magnitude look correct. At least for the first world.