Grandpa Jones did a version which was somewhat different ~~ haven't heard it since the early 50s or so. If memory serves, it went something like this.

On Monday we have bread and gravy
On Tuesday it's gravy and bread
On Wednesday and Thursday,it's gravy on toast
But that's only gravy and bread
On Friday it's rye bread and gravy
On Saturday it's whole wheat instead
But Sunday's a treat, 'cause we never get meat
We just have gravy without any bread!

Whatever else there may have been to his version, I've forgotten.