The Beer Inn-spectre is an achievement that requires the player to start any ale brewing below The Green Ghost Inn.
Required are 2 buckets of water, 2 barley malt, ale yeast and the main ingredient for the ale one wants to brew. Add the water first, then the barley malt, then the main ingredient and then the ale yeast.
Cider does work to complete this achievement. For this you will need 4 buckets of apple mush (4 buckets and 16 cooking apples) and ale yeast.