TORONTO - Lost of potential acquisition titles and awards season players are getting a ton of pre-festival publicity, but less celebrity-friendly documentaries are also a key component of the Toronto International Film Festival's slate.  This year, Davis Guggenheim's "From The Sky Down" about U2 is getting most of the opening night buzz, but there is another doc debuting on the same day that might be much more influential, "Last Call at the Oasis."

Directed by Academy Award winner Jessica Yu ("Protagonist," "The Realms of the Unreal") and produced by Elise Pearlstein ("Food, Inc."), the doc focuses on the growing concern with fresh water supplies across the globe.  The film features none other than Erin Brockovich, among others, who is investigating this issue in the United States.

Participant Media, the company behind "An Inconvenient Truth" and "Waiting for 'Superman,'" provided HitFix with an exclusive sneak peek of "Last Call" which you can view embedded in this post. 

Will "Last Call" be a call to action to the global water crisis just as "Truth" and "Waiting" were for the environment and education?  We'll no more after its debut at Toronto on Friday.

Look for continuing coverage of the Toronto Film Festival on HitFix and Awards Campaign for the next 10 days. 

For year round entertainment commentary and awards season news follow Gregory Ellwood on Twitter @HitFixGregory.