In Horrific Visions, 5 different colored potions can be found scattered across the zones. You're able to click these potions but the color and their related effects can change every time you step into a Horrific Vision. However, there is a way to determine which is the 'Bad' and 'Good' potions in the Horrific Vision of Orgrimmar.
What are Potions
In both the Horrific Vision of Orgrimmar and Stormwind, 5 different colored potions are scattered across the zones. Clicking a potion will cause you to drink it, giving you one of the 5 potion effects. Within a Horrific Vision run, all of the same colour potions will give the same effect, BUT each colour will likely have a new effect every run. The 5 effects are sanity related or a 5 minute buff that has a negative effect when it expires. If the buff hasn't expired the second time you drink the same potion, it will extend the buff by 15 minutes.
-100 Sanity (reduced by Cloak level)
Spicy Potion - Frequently breath fire dealing damage to nearby enemies. On expiration or removal you will catch fire yourself for a short time.
Sluggish Potion - Heals 2% of maximum health every 5 seconds. On expiration or removal will slow movement speed for a short time.
Sickening Potion - Take 5% less damage from all sources. On expiration or removal you will Vomit uncontrollably for a short time.
Since there is only 1 bad potion (-100 Sanity Potion), once you find out what colour that potion is, you can automatically click the rest of the potions for the rest of the run.
Determining the Bad Potion in Orgrimmar
There's a way to determine the bad potion in each Orgrimmar run. When you zone in, you're looking for the hut on the left before the Blacksmith building circled below.
Inside this hut you will find a note, with a dead Voidbound Ravager and a potion next to his body. This is the bad potion for your current run of Orgrimmar. In the image below, the Black Potion is the bad potion in this instance and you can click on every other potion without the fear of hitting the negative sanity potion.
Determining the Good Sanity Potion from the Bad Potion
We saw this in the addon Handynotes with the module HandyNotes: Visions of N'Zoth which contains useful information about Horrific Visions. It adds the location of Mailboxes for the Mail Muncher, the location of the Bad Potions, and much more! In Handynotes, they have found out that you can determine the Good Sanity Potion from the Bad Potion meaning you can also avoid the kiss/curse buffs as well! I'd recommend using this addon for Horrific Visions as it contains useful information.
Here's the information from the HandyNotes: Visions of N'Zoth module. Find the color and Bad Sanity potion using the above method and you'll be able to determine the Good Sanity potion's color!