Modding communities never cease to amaze me, and there's one really recent mod that solidifies my awe. The Witcher 3: Wild Hunt community has created a mod called Primal Needs that takes the game to an entirely new level. And no, despite the name, it has nothing to do with sex.
The Witcher 3's Primal Needs mod adds the familiar tropes of survival games. You'll have thirst, hunger, and fatigue bars that you'll need to keep track of. Simply put, you'll need to eat, drink, and meditate, or a lot of bad things will start happening to Geralt. To expand that more, your thirst meter is filled by drinking, but out of all the bars, it empties the fastest. It also fills the fastest, but you'll need to keep an extra close eye on your thirst over everything else. If you let it get too low, your stamina won't regenerate.
While your hunger bar empties slower than thirst, the Primal Needs mod makes food heal less than normal and gives it an expiration date. You don't want to be eating moldy food, after all! You can find food like you normally would if you're lucky, but otherwise you're going to be killing some monsters. They'll drop food for you. If you let Geralt go into starvation mode, his vitality will begin to drain. The last and final meter to keep track of is fatigue. This is corrected with meditation, and should be done quickly. The results are catastrophic if you don't keep up with it. If the fatigue bar hits a critical point, you won't be able to sprint, dodge, block, roll, or run.
All in all, Primal Needs sounds like an excellent way to make an already extremely fun game crazy difficult to play. Plus it gives you replayability for a game you probably already dumped a ton of hours into. If you want to give it a try in The Witcher 3, you can find it here.
Source: The Escapist