But even without the text it still has some problems, since without context you may think it mean body hydratation level or blood, unless you use colors (yellow, blue and red ) to distinguish between them, but even then, they are not always available/possible and pose accessibility problems, for visually impaired (is the correct word?) etc...

you could also use the text, if you target a specific locale, or also localizing the icons may make sense.

Since i don't know where this icons will be used i don't know what the best solution and i don't have a perfect solution.

I hope I have explained myself better.

edit: grammar