Help with potion in crafting recipie

[RedBullSlurpie]

So i have some custom armor in my mod, I would like to add potions of a certain type to that recipe, for example the 1 helmet gives you night vision, so i'd like the helmet to be crafted with a night vision potion, I've tried looking around but couldn't find any 1.9 tutorials for this. I know how to do recipes, just not sure on adding potions to it. My current line is below for one of my helmets.

 

GameRegistry.addRecipe(new ItemStack(SlurpiesDonglesItems.topaz_helmet), "  ", "TPT", "TRT", 'T', SlurpiesDonglesItems.hardened_topaz, 'R', SlurpiesDonglesItems.ruby_helmet, 'P', ***);

 

Where the ***'s are after the p at the end, is what i am not sure of what to put there to make the P in the quotes, know that it's supposed to be a Night Vision potion. If anyone could help me, i'd appreciate it, thank you.

[Notunknown]

You can create and pass an ItemStack as an argument.

 

I think it would be something like

 

NBTTagCompound nbt = new NBTTagCompound();
nbt.setString("Potion", "minecraft:night_vision");
ItemStack potion = new ItemStack(Items.potion);
potion.setTagCompound(nbt);

 

May be a couple of mistakes there, but I am sure you can fix any.