Three article boils down to the author being a whiny WSJ entitled asshole, which is what I expect from the WSJ.
Author, you don't need the 40 oz cup.
Quoted Expert, you need around 125 oz a day.
Author, but water is so boring and tasteless, I want sugar and you get a fraction of water from food right? I don't wanna drink water. Written Toddler Tantrum ensues
Author, so in conclusion you don't need that 40 oz water cup.