Caf Sludge
Alright. So for the convenience of time, some clones make a 'two-in-one' meal.
This is mainly done by clones that don't have a lot of spare time.
To try and save time, and instead of skipping meals, they created caf sludge.
This is where they soak their ration bars in their cup of caf until it has become a lumpy, gloggy mess.
The thickness of caf sludge can be determined to the ration bar to caf ratio.
2:1 is the preferred consistency.
It is known that Rex will consume caf sludge consistently, it makes up the majority of his diet.
Cody will only ever consume it if he is desperate. Like nothing else left to eat desperate.
Wolffe took one look at it and threw it out. Get that abomination out of his sight.
Bly hates it. He tried it once and was almost sick.
Fox was one of the first clones to consume it. Now it is pretty much his whole diet. Stone has to force proper food into him.
(I think I got it all @soliloquy-of-nemo)