Know Your Potions

Get ingredients from the table, mix them in the cauldron to discover all elements of each of your 7 ingredients, wasting them as little as possible. How much potions do you need to brew to know everything?
Each ingredient are made of 3 different elements. Everytime you mix 2 ingredients in the cauldron, a potion will be made from elements shared from both ingredients. Each ingredient, only shares 1 element with another ingredient, use this knowledge as you wish.