To make a Potion of Weakness in Minecraft, players will need a Brew Stand, Spider Eye, and Firepowder to power the stand.
If you don't have a Brazing Stand, you can craft one using three Cobblestones and a Brazing Rod placed inside a Crafting Table, as shown below.
You can get the rods of fire you need from flames that spawn in the Nether, usually around strongholds, and you can get cobblestones by mining stone with at least a wooden pickaxe and more.
When you get everything, just place them like we have in our picture above, and you'll be good to go, and all that's left to do is get some spider eyes and do some burning powder. For blaze powder, just toss the blaze rods into a crafting table, and bam, you've got the powder you need.
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To get spider eyes in Minecraft you will, as the name suggests, need to find and kill spiders in the game. You can find spiders in both caves and in the overworld at night.
But walking and killing them won't be enough, as you'll only have a small chance of getting a small amount of the eyes you need. So what you'll need to do instead is get yourself an enchanted sword from looting.
Looting increases the drops monsters have when they dye, so riding your sword is the way to go if you want spider eyes. Once you have the spider eyes, just bring them to the stand, dump the powder with a water bottle, then the spider eyes.
By the way, if you don't know how to get a water bottle, it's simple, just get some glass blocks. Take these glass blocks and place them in a crafting table using an iron bucket pattern - three V-shaped objects.
This will make a glass bottle. Now take this glass bottle to a water source to fill it up. Filling the bottle will turn it into a water bottle. After all of this you will be done and have a freshly brewed Potion of Weakness
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