One of variant of resources needed for healing kit:
Bandages (can also stop bleeding) - requires pieces of fabric. Can be crafted by scrapping robes, other clothing, and anything else made of fabric.
Antiseptic (can also be used to attempt heal diseases, acquired via open wounds). Can be crafted by using strong alcohol, or plants with antiseptic qualities. In first case medicine check is required. In second case nature check is needed.
Combining bandages and antiseptic will produce healing kit (medicine check is needed).
