The proper thing to do is inform management, if management doesn't comply and/or you feel strongly you should inform corporate.
Keep in mind these are usually day-old chicks and at all the TSC near me they sell within another day. They likely are fine despite my agreeing with you that they should have water offered.
Lastly, remember that chicks are messy and knock water over constantly and these are (whether we like it or not) "products for sale". If there were 30 wet chicks in there no one would buy any.
Again, if you feel strongly, I would go to the manager- if you are not satisfied go to corporate. But I will say all the TSC near me seem to keep good care of their chicks through sale.