The phrase "entire pitcher" means the complete amount or all of the liquid in a container that can hold and serve drinks like water or juice. Full definition
Granted you would have to drink the entire pitcher of THIS particular fresca to get that, you get the idea — these little suckers pack a big nutrition. (eatchicchicago.com)
** Tip: You can add ice to the pitcher if you are serving the entire pitcher immediately. (momsdinner.net)
You can BYOT (tequila) and for about $ 10 they'll bring you an entire pitcher of margarita mixture to add it to. (chicagoparent.com)