Don't groan, and don't go away.
They're trying to make fire in order to boil water that's full of dirt and tiny animalculae. I'm watching this guy blow on this smoking mass trying to get his fire going, and I'm thinking, that's why those four: earth, air, water, fire. The elements of survival. The powers that primitive humans had to master in order to survive, in order to have time that wasn't devoted to survival. They say that a dog is two meals away from a wolf. These people, though surrounded by cameramen, have committed themselves to try to live in a primitive environment with a small amount of supplies and the water they can get from unprotected sources. As one of them said, it makes you realize how precious water is. I remember the water game that we play at the Elements of Magick class--the Survivors water game is even more impressive.
Yeah, I'm sure there's a lot of editing in the show, but Africa is damned real.