This is the third half of the post on water
Primitive Methods of Finding Water
Some folks are planning to bugout. Depending on the threat, that might be a good or bad choice. Either way, you are going to have to have water.
Since water weighs 8.5 pounds (18 kilograms) a gallon, you can't carry all of your water for a multi-day trip, if you're walking, so you are going to have to find water on your journey.
Hopefully, you have preplanned routes, so you can get a map, ahead of time, for your route. These maps will show you ponds, lakes, streams, and rivers.
If they don't, you will have to find them then mark them on the map. Once you know where these water features are located, you will be able to use them as you travel.
How Stuff Works - How to Find Water in the Wild
Wikibooks - Outdoor Survival/Water