When we have all the ingredients and the brewing station will then come the time to make the potion, the fire bar that we have left is the first thing to use to make the fire powder, after that we have to follow a few steps in the brewing station and these are the following:
We enter the menu of the brewing station
We add the fire powder to activate the brewing station noticed by the bubbles
We add the water bottle in one of the 3 boxes that are at the bottom of the menu, now if we fill each of the available slots we will get more potions
Add the wart to the top box and wait for the process to take place
We add the puffer fish in the upper box and wait for the process, thus having the water potion
Optionally we can use the red stone, with which the potion will add a longer breathing time underwater
In conclusion, knowing how to craft a potion of water breathing is excellent, because we can advance further in this interesting and moving Minecraft.