The sentence has no context, so while it is a proper sentence, it makes little sense. Maybe this could be used for an athlete, or for a person working outside, where it would be important to stay hydrated. And someone who is just starting out might not remember to bring their own water.
this esperanto course if full of sentences like this that make you want to fill in the background. i've always imagined la komencanto refers to the new lerner of the language. for this sentence, i picture a nerves beginner standing with a mic in hand in front of advanced speakers trying to make a speech as part of an initiation ritual. (i like to imagine the esperanto community as some weird cult.)