How to use meds or burn books to heat up the house ?
I cannot find how to use the items in my inventory, when opening the inventory everything is grayed out.
You can only use an itens when the game "enable" its use for you
You can use Meds when a character is ill, http://thiswarofmine.gamepedia.com/Medications
And the books, its good to keep some of them, but to burn it you should convert it to fuel in the workshop. http://this-war-of-mine.wikia.com/wiki/Book
There are these wiki with tips and survival guides http://this-war-of-mine.wikia.com/wiki/Items http://thiswarofmine.gamepedia.com/