So when in nether as blazeborn class from the origins mod your water bar is there and isn't there at times of death or reloading the world.

fabric 0.14.0
mc version 1.18.2

ALSO could add maybe drinking from rain to replenish thirst? Just a idea

There is already compat with origins, if the origin has fire immunity it doesn't have a thirst mechanic.
With the command callback provided by origins you can set the thirst mechanic on and off too.
The second idea is not something I consider but you can drink from water source blocks :)