Man Drinking Water

Springs, yes, the springs of water in a bottle is the same as in a leather pouch.

The water is not so difficult to find. natural springs, streams, rivers, capturing rainwater, melting snow, enjoying the evening and morning dew, digging holes that seep water (even deserts) as Animals boiling (distilled) water. If you're thirsty, there are ways to find water. "Civilization" has reduced the knowledge of survival, but we can not survive with a little common sense and ingenuity.

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Coming through the rivers and streams and charging a leather case or a canteen.
Even back they found these rivers and drinking their fill and walk.
In this age, maybe a Hazzard for your health, these same rivers and streams are now charged with bacteria that can cause very bad health. Thank you to the pollution.

In the same way as people do today - largekly drinking from small streams. Unless there is something in the water contamination, then it is generally safe to drink. I've traveled to places far away and had to rely on water flow and so far (touch wood) have not had any problems.

Today, we can carry water filters and purification tablets makes it easier to get water from virtually all but the most contaminated sources.

Historically these things did not exist and the position they are in unfamiliar territory took a risk because there would be no way of knowing how far from the water, they were. The body needs plenty of water, usually about 5 liters per day when doing physical things such as trekking in the desert (the hotter it gets). There is a large amount of water to carry and explorers would be limited in what they could carry.

There are also many skills that our ancestors had that we do not use these days. Streams such are not the only sources of water and if you know where to look, this is not always so difficult to find. Some plants contain large quantities of water and you simply cut a length of the rod and the water pours out of him.

Sometimes they do not and they died. So it was not to go through it without causing a lot of water.