Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Thirst in a dream is corruption in religion and need for the world. Whoever sees himself thirsty needs wealth or knowledge. Quenching thirst indicates relief after hardship and wealth after poverty.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Thirst indicates longing for a loved one. It may also indicate poverty and illness. Quenching it indicates fulfilling a need.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Thirst is interpreted as worry and grief. Whoever sees himself drinking water and quenching his thirst, his worry will disappear.