As is pool water, assuming it is properly maintained, shouldn't be a problem. Small amounts might be unpalatable due to chlorine but healthy enough. People,especially kids, swim in it and normally take in significant amounts doing so. Even heavily chlorinated pools should be okay to drink as-is in small amounts. The human body handles chlorine pretty well. The normal stomach is awash 0.6 mole hydrochloric acid. Whereas pool water is maintained pretty close to normal Ph.

As time and the situation allows getting rid of the chlorine is simple enough. Simply pouring the water back and forth between containers can get rid of some of it. Less energy intensive simply exposing to air will dissipate the chlorine in time. Faster if the water is warm.

We are talking about survival water here. Your not opening a water bar. Given a choice between a well maintained residential pool or some of the mud puddles I have sucked water out of I would take the pool every time.

Of course if your actively contemplating utilizing a pool as a water source you might invest in a few inexpensive carbon filters. If the pool won't be maintained you would simply treat the water like you would from any other open source. Filtering and chemically treating as needed.