I prefer this method over the solar still. They will work anywhere that there is green vegetation. By wrapping a clear or opaque plastic bag around a green leafy bush or limb, The sunlight will draw water from the plant into the bag. This water is also readily drinkable.
Place a small stone in the bottom of the bag. Ensure that you tie or wrap the opening of the bag to the limb so that no condensation escapes. Also this wont work if you have holes in the bag.
The brighter the sunlight, the more water it produces. It's a good idea to carry a few bags on you to be able to use this method if needed.