Salva is thinking about whether he should do it at his age now, so I believe that he would give out some of his water.
I believe uncle doesn't want to leave Salva but he wants to help his tribe and his country.
The group's attitude towards Salva because now that uncles gone they don't want him there they only cared when uncle was there because uncle was like their leader now uncles gone it no longer matters to them about Salva. Salva will try his hardest to walk and catch up every time he lags behind.
Uncle said to Salva that southern Sudan is probably been burnt down by the rebels or they might have been shot and nobody knows where they are now. Uncle helped him in the desert by saying all you need to do is walk to that bush or those rocks or the twigs right there so Salva did the same to help him survive and stay together with the others.
