I've got two hubs about beer making and beer making kits. I knew the Google policy prevented content that includes or links to the sale of beer or hard alcohol. I wasn't sure where beer making kits fitted into this policy so I checked out other hubbers articles and there were lots some of which were by very experienced hubbers so I thought it would be OK.
I've just checked again there are still hubs about beer, beer making, beer kits which include links to beer kits or other brewing equipment. One of these hubs has the following Google capsule.
Ads by Google "Organic Beer Kits" "Beer Recipes" "Beer Equipment"
If Google is happy to advertise these things themselves surely we ought to be able to write about them and include our own links to similiar items.