potion_water:
  worth: 2.0
  item:
    ==: org.bukkit.inventory.ItemStack
    v: 2730
    type: POTION
    meta:
      ==: ItemMeta
      meta-type: POTION
      potion-type: minecraft:water

Add simple water potion item since it's actually hard to get via commands
Add simple water potion item since it's actually hard to get via commands
