Part 4 - Mixable Ingredients
Chapter 1 - The Pancake Mix
[To the player, the pancake mix in the Bisquick box is a solid powder, but internally it's easier to treat as a liquid.]
The Bisquick box is a fluid container. The fluid capacity of the Bisquick box is 32.0 fl oz. The fluid content of the Bisquick box is 8.0 fl oz. The liquid of the Bisquick box is pancake mix.
[However, this means we don't want the game telling players that fluid containers hold *only* liquids...]
The can't put solids into a fluid container rule response (A) is "[The second noun] hold[s] only liquids and other mixable ingredients."