It would be an awesome option in the settings to have a survival mode with hunger, thirst, and sleep, even temperature regulation. It just feels like its missing this component. Your traversing this island and never have to eat or drink or sleep? I think it would be a really solid option for people to be able to choose to add this as a setting or game mode.
Survival Mode:
Food Ideas - survival ration, wild mushrooms, can of beans, MRE. You could craft MRE at consumable bench with wild mushroom (or jerkey see below), and can of beans.
Drink options - dirty water, cola, fresh water, electrolyte drink. You could craft electrolyte drink with 4 electrolyte and 1 fresh water.
Sleep - have a bed in the safe house, or have a sleeping bag you can place, or both.
Negative Buffs when low on status - Slower stamina regen, worse aim stability, slower movement speed, health decrease, death.
It would really add a level of realism and additional challenge.
Wildlife and Hunting - this is a pipe dream but this would be awesome! Not to the detail of thehunter call of the wild, but basic hunting of local deer, hogs, rabbit, and wolves for meat. The meat could craft Jerkey at the consumable bench.
Temperature Regulation - add schematic for cold weather clothing. During nights and weather events, make temperature drop and have players need cold protection if they want to prevent negative buffs.
Negative Tempurature Buffs - Slower stamina regen, worse aim stability, slower movement speed, health decrease leading to death.
I would pay $20 for this DLC. This game has tons of further potential just waiting to be unleashed!
Great job!