"Ĉiaj boteloj povas enhavi akvon."
Translation:All kinds of bottles can contain water.
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Have a better picture: http://www.thisiswhyimbroke.com/klein-glass-bottle
You can even plug the "opening". Volume is a subtle thing;)
Your sentence is either past tense ("they could yesterday but not anymore today") or conditional ("they could but only if some condition were fulfilled").
I'd say that's different from a clear positive statement that the bottles can (right now, definitely) contain water.