As of September 11 2021, the highest-damage potion you can make in Wacky Wizards with free ingredients is a "Nuclear firework hot crumbly explosive potion"

The spells in this potion are:
- Nuke (8 damage)
- Firework (6 damage)
- BecomeBeans (6 damage)
- Dynamite (6 damage)
- Chilli (1 damage + 5 afterburn)

These stack up to 27 impact damage + 5 afterburn damage

Beans also deals 6 damage but it can't be included with this recipe because it mixes with Dynamite and Chilli

Several of the same spell will not stack damage:
100 Nukes will deal the same damage as 1 Nuke

Every other spell deals 4 damage and they do not stack damage with other 4-damage spells:
A potion with Missile + Rocket + Pop + ExplodeHead + HeadBang will deal only 4 damage

I have painstakingly tested every single free spell in this game, so anybody that tells you that they have a potion that deals more than 32 damage with free ingredients is lying through their teeth

I will not be testing premium ingredients, and in fact, I will never be touching this game ever again