How to cure a zombie villager in Minecraft for cheap trades
One Golden Apple and one Splash Potion of Weakness turn a zombie villager back into a villager, and the villager rewards you with a permanent discount.

A Splash Potion is a throwable potion that affects everyone in the area where it breaks.
Brew Gunpowder into any potion to make it a splash potion. Thrown, it applies its effect to players and mobs nearby, weaker the farther they are; healing splash potions hurt undead mobs, and splash water puts out fires. Dragon's breath turns it into a lingering potion.
This item has no crafting recipe.
One Golden Apple and one Splash Potion of Weakness turn a zombie villager back into a villager, and the villager rewards you with a permanent discount.
Gunpowder turns any potion into a Splash Potion with the same duration.
It can be found as loot in Trial Chambers. Bartering: Piglin.
It throws potion effects at an area.
No: only one per inventory slot.