What's the gist for along walk to water chapter 5?

There was a big lake that would take a 3 days walk from nya's village. Every year when it stopped raining and the pond closer to their village dried up, Nya's family moved to live closer to the big lake so they could get water. They didn't live by the big lake all year round because there was so much fighting nearby. Her tribe, the Nuer, fought with the Dinka tribe so that one of them can have the lake to themselves. Nya's family only lived near the lake when there was less fighting which was the drying season. At the lake, Nya's Job was to dig big holes until the water came out. The water was dirty but she had no choice but to drink it.