If you’re in a place that has no obvious source of water, you can use a tarp and a cup to get water from the air. If you dig a hole in the ground, and place a cup in it. Cover with a tarp and secure it. Then put a stone in the middle of the tarp, right above the cup.

As the air within the tarp cools, the moisture in the air will evaporate and collect on the underside of the tarp, and drip into your cup.