Ibn Jurayj (may Allah have mercy on him) said that Ata (may Allah have mercy on him) was asked: What about selling water in water-skins? He replied that this case is different; here a man draws the water and carries it, so there is no harm in it. This water is not like the surplus water that simply dries up in the ground.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11063