I will tell you one story. Buddha was traveling through a forest. The day was hot – it was just midday – he felt thirsty, so he said to his disciple Ananda, ”Go back. We crossed a little stream. You go back and bring, fetch, some water for me.”
Ananda went back, but the stream was very small and some carts were passing through it. The water was disturbed and had become dirty. All the dirt that had settled in it had come up, and the water was not drinkable now. So Ananda thought, ”I shall have to go back.” He came back and he said to Buddha, ”That water has become absolutely dirty and it is not drinkable. Allow me to go ahead. I know there is a river just a few miles away from here. I will go and fetch water from there.”