Minecraft potion IDs are found on Minecraftinfo.com. The site includes the IDs for all the items in Minecraft, including the potions, with pictures and descriptions.
Minecraftinfo has IDs for all the items in Minecraft. All of the items are listed on one page with name, picture, version of Minecraft in which it was added, and ID number. When clicked on, each item includes a short description with information relevant to the game, such as how to make the item, what the item is used for and where to find the item. For each item, the site also provides a See Also section with links for similar items.