To save time from making potions on your own and keep the player safe from lava. The user won't have to keep opening the brewing stand to add more stuff to the potions.
Controls for Game:
Access inventory: E
Search Items: Compass in top right of inventory
Move Left: A
Move Right: D
Move Forward: W
Move Backwards: S
Fly: Double Space
Crouch/Connect Hopper: Control
Scroll Through Inventory: Scroll Wheel
Step 1: Gather Materials
The materials you need to build an automatic potion brewer are as follows
Brewing Stand: 1
Sticky Piston: 1
Redstone Block: 1
Redstone Torch: 1
Step 2: Set Up Area to Place Blocks
Step 3: Place Chest With a Hopper to Prepare for Finished Potions
Place a chest down and make the hopper enter the chest by croutch placing it. To make sure it is correct, look at where the hopper feeds out and it should be into the chest.
Step 4: Add a Brewing Stand With a Hopper to Feed Into It
Place a brewing stand on top of the hopper by croutch placing it. This makes the brewing stand feed the finished potions into the hopper below for the finished potion chest. Then, add a hopper on top of the brewing stand for feeding the potion materials into it. We need this to make it become "automatic."
Step 5: Place a Sticky Piston With a Redstone Block and a Dropper
Place a redstone block next to the bottom hopper for pushing the potions to the finished chest. To do this, you will need an empty block below the redstone block as well to make sure it has room. Place a sticky piston on top of the redstone block. Make sure the "sticky" part of the piston is facing down and connected with the redstone. Then, place a dropper on top of the sticky piston to feed potion materials into the top hopper.
Step 6: Place a Hopper and a Double Chest Above the Hopper
Croutch place a hopper facing the front of the structure to feed the water bottles for potions into the brewing stand. To make sure this is correct, the hopper's tube should be feeding into the brewing stand like the pitcure. On top of the hopper that was just placed, croutch place a double chest for keeping water bottles in for future potion creation.
Step 7: Place Three Droppers
These droppers are used to feed potion materials into the hopper for creating the potion. The first dropper, needs to face the top hopper. The next hopper labeled "2" needs to face the top hopper as well. The third dropper, however, is facing the brewing stand to make sure it has power.
Step 8: Add a Stone Block and Add Redstone
Add a stone block on the top left of the overview to hold redstone on top of it. From an overview look, place redstone on top of the blocks in the L-shape shown in the image.
Step 9: Place Torch and Button
Place a redstone torch to connect the redstone placed earlier. This is used to power up the redstone to brew the potions. We will also need a button to temporarily power up this redstone. To do this, place two stone blocks going upwards next to the chests for finished potions and the hopper to feed water bottles. After this, place the button on the front of the top stone block for powering the redstone up.
Step 10: Grab Your Potion Supplies
For this example, we are making a fire resistance potion so we are going to be using blaze powder for powering the brewing stand up, 5 nether wart to start the potion, 5 magma cream to make it fire resistance, and 5 redstone to extend the potion effect. The reason for having five of each resource is for troubleshooting if the process does not work as intended.
Step 11: Fill Droppers
1.) In the dropper labeled 1, add the nether wart.
2.) In the dropper labeled 2, add the magma cream.
3.) In the dropper labeled 3, add the redstone.
4.) In the dropper labeled 4, add the blaze powder.
These droppers are labeled in this order because when you make a potion normally, these resources would go into the brewing stand in this order.
Step 12: Put Water Bottles in Chest to Feed Into the Brewing Stand
This step is to make sure the brewing stand is being fed the water bottles it needs to create the potions. To do this, right click the chest and add any water bottles you have to it.