A bath was a tub of water used for bathing. Bath could also refer to the process of bathing. Chiss bathed using soap. Droids had what was known as oil baths.
On one occasion, when Princess Leia Organa was a toddler, she ran from her bath into the Royal Palace of Alderaan's formal dining room wet and naked during a diplomatic dinner, causing her nanny droid WA-2V to chase after her.