This is a bug. Two facings of the empty/full versions are not dyeable with the furniture dye tub. We'll fix it!You can dye the Marble bar pieces with a furniture dye tub, except for the sink piece. So two suggestions pls, make them dye-able and have running water like the bath tubs... (although I know it's too late...)
@Dot Warner - they partially hue, just the countertop part
@MalagAste - you can pour water into the sink from a water pitcher.