Giving an item to the player

I want to make a mod that turns wet paper into dried paper (Both custom items I've added) when the player holds it in their inventory for 10 seconds. I can make it remove only the wet paper item, but I haven't found a way to give the player a dried paper item. The [add [ ] to (Event/target enity)] block just won't give the player an item no matter what the item is.