StackablePotions (Port)
This is an effective adaptation for version 1.21 and beyond of the simple Stackable Potions mod by the popular developer Cursed1nferno, which had stopped receiving updates. As the name suggests, this mod allows various types of potions to stack logically, though only up to 16 units.
How did the developer creatively enhance game balance? They introduced a brief coold period of over a second before using splash and lingering potion varieties, which successfully prevents endless chaos of lethal potions in the player's inventory.