That's... huge! My biggest fear would be that whatever I was drinking got to the other temperature before I was done... the cold stuff would get too warm, and the hot stuff too cool. I guess it's a challenge to drink it all quickly enough...
52 ounces, though... 64 in a gallon, so one of those would cover an entire day's worth of water drinking!
So... ermmm... uhmmm.... where do you find those kinds of critters?