Alchemist doesn't let you make potions, hilariously. You need Brew Potion for that. Alchemy lets you make things like alchemist's fire, holy water, antivenom, various poisons etc.

It works just like Rituals in that you have to have the instructions written down somewhere as well as the correct amount of components in order to make anything. I think I kind of accidentally cheated you a little here in that you don't have any formulas; Clerics are supposed to start with two level one rituals and since you're an alchemist instead of a ritualist the Builder didn't prompt me to give you anything.

So uh why don't you pick two 1st-level alchemy formulas for yourself so your bonus feat is actually useful