[stickfigure]

"Sweet water" is a common English-language (possibly "American old west") euphemism for fresh water.

[unityByFreedom]

Sweet tea maybe.. I've never heard "sweet water" but webster does have this,

https://www.merriam-webster.com/dictionary/sweet%20water

> : a sugar solution

> especially : one obtained by recovery of waste sugar during refining

[stickfigure]

Try `sweetwater` without the space:

https://www.collinsdictionary.com/us/dictionary/english/swee...

[presto8]

I would not say it's common: I'm a native (American) English speaker and I've never heard the word before! I would just guess it's some kind of flavored water before reading this thread.