Another trick I read about but never tried is useful if night dew/frost can be expected. Suspend a black plastic sheet a foot or so off the ground and put a small weight in the center. Dew will collect on the sheet. Early each morning gently shake the plastic and the dew will run to the low spot both top and bottom. You can put a container to catch the bottom drips and scoop up the puddle on top. A logical extension of this would be to suspend long strips of plastic sheet angled so the collected dew dripped directly on your plants. Admittedly this idea has problems -- flimsy, subject to strong wind, partially shading your plants, etc but might work.
John
John