A collection of beverage bottles includes respective color-coded beverage caps. The beverage caps have permanent passive non-verbal indicia indicating the identity of the user of an unencumbered beverage bottle without tangible surface-interfering customized or temporary identifiers, such as tangible surface interfering elements, including stick-on labels, customized beverage can lids, or modified surfaces of beverage containers. The color-coded bottle caps are used as the actual caps for conventional beverage bottles. The color-coded caps do not add cumulative indicia to the bottle caps, in additional to pre-existing indicia, such as brand name logos, on the bottle caps.