What are these containers called?
I know you can get them from Uline, they call them Carboys.



I'm not sure if this is a standard name for a jug with a spigot, googling for carboy would lead me to believe it is not. As Jacob S pointed out, these are sometimes called a "rectangular carboy"

There is a similar product at The Container Store, they call them Slimline Fridge Jugs