Look for water. Any source of water is good. As long as you have it, you can purify/desalinate it.
• If fresh water is available, boil it for 2-3 minutes to be sure.
• If you have a desalinization device, great! If not, there are several methods to desalinate it.
• One method is distillation. Construct a solar still, or one that works over a fire.
• A solar still can be constructed by filling a large, flat container with salt water or even urine which can be re-usable, if need be.
o Place a smaller container in the center with a rock in it to hold it still. Cover it with a thin sheet of plastic or whatever you have and place a rock in the center above the cup.
o If placed in direct sunlight, water should evaporate and condense on the plastic running down and dripping into the smaller container.