I believe their point is that it is possible to consume over a gallon of {liquid} per day, and as someone who used to drink unhealthy amounts of soda, I promise it is possible to do it with even sugary, fizzy beverages let alone tea. Caffeine also has addictive properties which can override rational thoughts.
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Definitely not true. I used to regularly drink 1.5 gallons a day.
A gallon is a recommended daily intake for men:
https://www.health.harvard.edu/staying-healthy/how-much-wate....
A gallon of water. Not a gallon of Earl Grey tea…
(I do agree that the parent's Arizona might not be quite comparable, given the sugar content in those drinks.)
I believe their point is that it is possible to consume over a gallon of {liquid} per day, and as someone who used to drink unhealthy amounts of soda, I promise it is possible to do it with even sugary, fizzy beverages let alone tea. Caffeine also has addictive properties which can override rational thoughts.