Adding items with keywords
Inside your minecraft folder, in the config folder, and inside the thirst folder, you'll find the keyword.toml file. This file allows for adding items faster but is less configurable.
Keywords allow for faster implementation of new thirst-quenching items. Every list of keywords is really just a Regular Expression (regex).
To not get too deep into regex, if an item's id (i.e. farmersdelight:apple_cider) contains a keyword (i.e. apple), the item will get selected. If you wanna learn more about regex, you can find a sick playground here.
To assign hydration and quenchness values faster, the config is split into 3 "lists" of keywords. Every item selected by a list is assigned the default hydration values for that list.
Each keyword is separated by a |. For example, here is the Drinks keyword list
(?:\\b|[^a-zA-Z])(drink|juice|tea|soda|coffee|wine|beer|cider|yogurt|milkshake|smoothie)(?:\\b|[^a-zA-Z])
Since any item that contains a certain keyword will be given hydration values, and some mods add very peculiar items, to avoid bugs like this you can use the Keyword Blacklist. This is another list of keywords, but for items that must not be selected by other keyword lists.
Another important thing to mention is that this config has the lowest priority, meaning that any items that have hydration values added by code or other configs will also be ignored, so you dont have to worry about damaging existing ones.