Potion Itemstack?

[intermediateuser]

I have some code that is rendering icons on a gui, like so:

 

// Fishing Rod
        vendorStack = new ItemStack(Item.fishingRod);
        itemRenderer.renderItemAndEffectIntoGUI(this.fontRenderer, this.mc.renderEngine, vendorStack, k+20, l+81);

 

I'd like to also render Potion of Healing II and perhaps other potions on this gui, but I can't figure out how to make an ItemStack as the specified potion.

[Draco18s]

new ItemStack(Item.potion, 1, 8204); //potion of harm

 

http://www.minecraftwiki.net/wiki/Potion#Data_value_table

Note:

Some potions in creative have different damage values than listed.  Potion of harm gotten from the creative menu is 8268.  They are functionally identical due to unused bitflags.  https://mojang.atlassian.net/browse/MC-1705