Several celebrities are trekking to Africa for a weeklong climb up Mount Kilimanjaro. They decided to help spread the message for clean water and make available clean water for those 1 billion people who are without healthy, drinkable water.

Among those celebrities are Emile Hirsch (Milk, Into the Wild), Jessica Biel (The Illusionist, Valentine’s Day), Lupe Fiasco, Isabel Lucas and Elizabeth Gore set to climb the continent’s highest peak.

Supporters are encouraged to visit Summit on the Summit Base Camp where they follow the celebrities trek up the 19,340ft mountain with videos feeds and tweets.