Every Minecraft player knows what standard potions in the game are capable of. But most of the players do not want to craft them, because it takes a lot of time and there is not much benefit from them. That is why the author of the mod “Missing Potion Recipes” decided to add new and cool potions to the game.
Decay Potion: Add a Wither Rose to the Awkward Potion to create it.
Long Mundane : add the Redstone dust to a Mundane Potion.
And in order to poison the Arrowheads you need a Mundane and Awkward potion. Place the poisoning you need in the central slot, and around the arrow.