Soda Bottle Self Waterer

I was reading here earlier about a soda bottle self waterer. I would really like to know how to make one. I almost bought those aqua globes off TV because I am bad to forget to water sometimes and if I am ever gone on vacation or whatever my son is not always the best to remember to water the plants.
Thanks in adavance

 

here's a link from pepperdude on soda bottle pots. Hope this helps.
http://members.tripod.com/toppertwo/pop_bottle_pots.htm

 

Thanks so much for the link. That is a very neat idea and an easy way to make those. I am going to try my hand at making some real soon.