Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
An ewer in a dream is a trustworthy servant. It may also indicate a righteous son. Performing ablution from it indicates repentance and relief.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
An ewer indicates a knowledgeable or repentant man. Drinking from it indicates gaining knowledge.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
An ewer is interpreted as a son. Breaking it indicates the son's death.