Do-Right offers for sale a 3-gallon glass carboy, to serve as the collection vessel for the SWS-200 solar still. The carboy comes with a silicone bung, or stopper. Silicone, rather than rubber, has been chosen because it is inert. As well, a small quantity of Easy Clean sterilizing powder (active ingredient: sodium percarbonate) is provided. This powder sterilizes by oxygenization, rather than bleaching, and is completely non-toxic.
Note, a minimum of two carboys are generally needed (one for your still, the other for your water crock). More are necessary if you plan on storing surplus quantities of distilled water. These surpluses are generated on hot sunny days, and can tide you over on non-sunny days.