Sure. Pick a clear, flat spot and lay a tarp or a sheet of plastic. Make a shallow pit, put a bowl in the center, and pour water into the pit. Let the sun do the work. The plastic will collect condensation on its underside; you’ll see droplets form and trickle down into the bowl. If you have a piece of charcoal, place it in a small container that can sit inside the bowl. It’ll help remove some impurities. If you need more purification, boil the water for a few minutes before drinking. That’s it. No gadgets, just simple physics.