Expansion on capacity, we are given 2 units of water at the beginning of the game so unless it is reduced
the assumption is a starting flask would have 2 units also. The special zombies is to allow for expanding
the capacity as the game progresses, instead of all being possible at the beginning of the game. That method
would give that procedure it's own directional goal, and separate it from the basic collection for crafting, so it
would be associated with exploration.
Following the logic of how hunger thirst have been, and going by your description of the effects in non-forest
biomes, As a player progresses, they will have a real need, for more fluid consumption over time, to survive. So
it gives a directly usable effect to coincide with the biome progression. I was trying to think of something that
fits with the expanding the biome progression.
The actual drop I was thinking of was Bladder and hide, the larger the more volume. The addition of spleen etc. was
to leave it open to interpretation and artistic license inhouse. Because I have learned that even a potentially good
idea submitted can and is usually made better, internally. Any item or recipe can be used to increase capacity, I
just used those as a descriptive to give it value and continuity throughout game play, but at the same time not be
intrusive, or inconvenient, to any other activities.
I wrote it directly, instead of using notepad++ and proofing it like I usually do. Sorry for the confusion.