Take 2 water bottles, or Gatorade bottles work better. Remove the caps and labels. Glue the caps back to back, with the threads showing. Get a 1/2 inch or similar pvc pipe, or any pipe will work. Drill a hole through both caps the size of the pipe you are using. Pipe should be the about the same length as bottle. Leave a 2 inch space from the bottom of the bottle to the end of pipe. Screw the lids on one bottle and push the pipe through the lids. Glue the pipe to the lids. You should have about 2 inches protruding the bottle. Now screw the other bottle on uspside down. Flip over, as the bottle with the short pipe will be the dirty water bottle. Fill with water from any water source. Sit in the sun for a few hours. Water will turn to vapor as the water warms, exiting the pipe and condensing between the upper, longer pipe and the bottle. Unscrew the lid from the bottom bottle and turn upright. Now unscrew the lid with the longer pipe and your water is single distilled. You also use any heat source, like over a flame, to speed up the process. Just leave the bottle suspended over the heat source so as not to let the flame or heat source touch the bottom of the bottle. If you want more info there are several videos you can watch of solar distillatory on youtube. Good luck. rockhound