Making a Pop Bottle Garden Sprinkler?

I love your site and learn something new each day. A couple of weeks back you had a tip for using large pop bottles which were turned into a garden sprinkler. I printed the tip out and gave it to my son, but had told my cleaner lady about it and she pleaded with me to see if I could get a copy of it for her.

My son's office is like a lunatic asylum, nothing can be found easily. Is there any chance someone could provide me with the instructions?
Regards.

By Carolyn from South Australia