A greener procedure that you might consider to replace the traditional "formula of a hydrate lab" that has typically used copper II sulfate.
Beyond Benign, a national nonprofit, established in 2007 to equip educators, scientists, and citizens with the tools to teach and practice green chemistry to achieve a sustainable society, just announced a strategic partnership with Flinn Scientific.
You can perform an orange to black chemistry demonstration using materials commonly found in stores. The reaction appears to be similar to the Old Nassau reaction, but uses greener reagents. This is a great demonstration to do around Halloween time.
The June 2015 issue of the Journal of Chemical Education is now available online to subscribers at http://pubs.acs.org/toc/jceda8/92/6. This issue includes articles on curriculum; assessment; inorganic chemistry; investigating galvanic cells & exploring LEDs; atomic structure; nanochemistry laboratories; physical chemistry in the lab; synthesis.