When you are in a wilderness survival situation your second greatest need is water. Now you know that not just any water will do, you need to ingest only the purest and cleanest water possible. Unfortunately clean water is not easy to find in the wilderness. You may find water, but to be on the safe side, you need clean it before you drink it. Drinking contaminated water can lead to uncomfortable side effects at best and possible death at the very worst. So you need to take the necessary steps to purify your drinking water.
Here is an article from Nature Skills.com about several ways to purify wilderness drinking water. Read and learn so that if you would find yourself in such a situation, you will know what to do.