There was an interesting article in the Economist about a chemist, Mr. Chhatre, who developed interesting coatings for aluminum mesh to increase their fog collecting properties. He’s starting a test project in South Africa.
We can use technology like this as one of the possible top to the DRIPS project. Since the his invention can collect one liter of water per day per one square meter of mesh. This could be delivered directly to the roots via the DRIPS system. More food for all!