If Global tag = true then give player item when key is pressed otherwise dont.

Hey there!

So i'm trying to make a mod that makes it so that if you are infected it lets you summon an item by pressing a key. I know it is possible with procedures and nbt tags im just not sure how i have got the body done its just the nbt tag bit im stuck on. Heres what it looks like:
 

If -  (The bit im stuck on, I've tried global variables but i think that will affect ALL players if 1 player is infected)

do- If - true

      do - Add 1 (item) to players inventory.

Else - If - false

          do - print - "You do not have correct permissions!" <------- (not sure about this cause it will print in the console [I think])

Any ideas?