I think I already have the item, I just need to figure out how to use stuff (like the health pack).
Ah, I see. Yes, there's a lot of trial and error involved! Probably more than I intended!
I didnt make it very clear but equipping the health pack recovers a little bit of health overnight. It allows a survivor to recover health without losing a turn by resting in the bed. So, you can gather supplies and recover health at the same time, for example.