Gather ingredients: Nether Wart, Water Bottle, Fermented Spider Eye
Brew a Water Bottle into a Potion of Weakness
Add Nether Wart to Water Bottle in a Brewing Stand
Wait for Nether Wart to finish brewing
Add Fermented Spider Eye to the Awkward Potion
Collect the resulting Splash Potion of Weakness by adding gunpowder to convert it to a splash version
Ensure you have gunpowder and the Awkward Potion ready before converting to splash