The comparisons are always staggering, even these in gallons from Loch Ness Water Gardens and Creative Commons via 2degrees. For reference, a full bathtub is deemed to be 50 gallons.
Apparently, if you replace a cup of coffee a day with tea, you could save 10,950 gallons a year; orange juice with water, 16,717 gallons; and milk with beer 15,582 gallons, though I doubt the realism or wisdom of that last example.
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