The word(s) "sweet" appears 3 time(s) in 3 verse(s) in Quran in Saheeh International translation.

(1) And it is He who has released [simultaneously] the two seas, one fresh and sweet and one salty and bitter, and He placed between them a barrier and prohibiting partition.

(2) And not alike are the two bodies of water. One is fresh and sweet, palatable for drinking, and one is salty and bitter. And from each you eat tender meat and extract ornaments which you wear, and you see the ships plowing through [them] that you might seek of His bounty; and perhaps you will be grateful.

(3) And We placed therein lofty, firmly set mountains and have given you to drink sweet water.