Active carbonation pressure monitoring cap

A fermentation monitoring apparatus comprising a drinking bottle cap, wherein the drinking bottle cap comprises:

• a fluid well holding a quantity of fluid;
• and,
• at least one fluid communication channel configured, such that,
• when the drinking bottle cap is coupled to a first end of a vessel to define a chamber and a gas pressure in the chamber exceeds a predetermined threshold, then the fluid well receives gas released from the channel via the at least one fluid communication channel such that a visual indicium of gas bubbles is formed at in the quantity of fluid indicating that the gas pressure in the chamber has exceeded the predetermined threshold.

A drinking bottle cap, comprising:

• a fluid well;
• and,
• an umbrella valve comprising a diaphragm, a tapering tip, and a retention module,
• wherein:
• an outer circumference of the diaphragm defines a circle in a first plane, and, in a non-deployed mode, the retention module is resting above the first plane such that, when the umbrella valve is coupled to the fluid well, the umbrella valve is preloaded with a predetermined tension configured to pull the retention module through a wall of the fluid well;
• and,
• upon pulling the retention module through the wall, the tapering tip engages with a valve receiving aperture.