The Japanese have long understood the health virtues of Binchotan charcoal, a type of hardwood charcoal made from oak burned at extremely high temperatures. Its porous surfaces make it an effective filter and water purifier while simultaneously releasing natural minerals. In Japan, it's common to use Binchotan charcoal sticks in the bath and as filters for drinking water; here are some ideas for stocking stuffers.
Above: Kishu-Binchotan Water Purifier by Sort of Coal; $30 from Merchant No. 4.
Above: The Binchotan Scrub Towel has an ultra fine powder of Binchotan charcoal embedded in the fabric; $18 from Terrain.
Above: Binchotan Charcoals for the bath, for cooking, or for filtering water; $20 from Terrain.