If you drink two gallons of water in a single sitting you can gain 16.66 pounds of weight
Drinking 2 gallons of water in a single sitting without consuming enough sodium, potassium and possibly other electrolytes or nutrients can kill someone or cause serious health problems
I am not telling anyone to drink this much water in a sing!e sitting
Competitive eaters can probably eat more than 16 pounds of food & beverages in a single day