Homeostatic 
A temperature and thirst mod that doesn't defy logic:
- Environment temperature is relative to a number of external factors based on wet-bulb globe temperature - WGBT
- Biome temperatures in Minecraft are overridden to give a more authentic feel to temperatures that players can relate to.
- Just because there is snow, doesn't mean that it is stupid cold. That doesn't work in reality with Minecraft anyhow, since the biomes are mixed where they are often close.
- Temperature smoothing is done to try and normalize temperature with nearby biomes.
- Seasons are taken into account if using Serene Seasons. (At least until there is a viable season alternative).
- Thirst is affected by the environment temperature, body temperature and activity.
- Water is life
- Being overheated will cause water to be used rapidly, which could lead to bad effects or death.
- Body temperature is regulated through armor modifications and heat sources.
- Modifications can be "sewn" into any armor that gives various protective abilities.
- Cold isn't an energy form like in other mods (and Minecraft actually), that's just dumb.
- Lack of heat causing the body temperature to lower will eventually cause bad effects, even death.
- Being wet is really bad (unless you're overheated), it can causing rapid cooling.
- Blocks that generate heat aren't measured in temperature, but rather the thermal radiation they release, which affects how "hot" it is to be near these objects.