Jamil said on the Oak Aging show that he puts them in a canning jar with a little water, and sterilizes it in a pot of boiling water (with the cap on loosely). He then pours the oak and water (it extracts some flavor) into the beer in a corny keg, so he can taste it frequently to decide when it is done, I'm sure a carboy would work fine too. 1-2 oz / 5 gallons...