[1.8] use akward potion in recipe ?

goods

this is an easy one

i wanna make a recipe whith akward potion  but i dont find it in the items class,

i think is a meta item from Items.potion but whath it is ?

	GameRegistry.addRecipe(new ItemStack(MercenaryModItems.cartucho12G_antiEnder, 16,0), 
		new Object[] {"BSB", "PPP", "H H",
		'A', new ItemStack(MercenaryModItems.aceroMercenario,1,0), 
		'B' ,new ItemStack(MercenaryModItems.obsidianaMercenaria,1,0),
		'S' ,new ItemStack(Items.potionitem ,1,0),//this must be akwar potion 
		'H' ,new ItemStack(Items.iron_ingot ,1,0),
		'P' ,new ItemStack(Items.gunpowder ,1,0),

	});

thanks