How do you make a pot in RuneScape?

There are two answers that can be given in reference to the Word "pot", one being the crafted object, the other being the slang Word used to reference potions.

Pots can be crafted on a pottery wheel with Soft Clay and then "fired" in the pottery oven to complete. Best locations for such spots are in Barbarian Village and south of the Varrock East Bank near Aubury's.

Potions are made using the primary ingredient (herb) on a water filled Vial and then adding the secondary ingredient (makes a 3 dose). To make a 4 dose, use a three-dose on another three-dose potion (this will make 1 four-dose and 1 two-dose).

Hope that helped.