Where to find the materials to craft medicine in Dying Light 2

[Windows Central]

Crafting medicine is crucial to surviving in Villedor but it's not made obvious where to get the materials. Here's what to do.
In Dying Light 2 there's no regenerative health. While you can use UV light sources to reset your immunity, your actual health won't go back up without some assistance.
There are different methods to regaining health, including sleeping or sitting at a campfire. But when you're out exploring you'll need to rely on medicine.

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