I was getting very tired of watching my herbs die because I forgot to water them EVERY day. So I decided to try and make my own self-watering pots for them.
As you can see above I used different containers: An orchid pot, a metal tomato can and a plastic nudlecup. You can paint them, if you like.
Coffee mugs, will do as well and could look very pretty I think.
Soak the string in water and use a knitting needle to stick it into the bottom of the plant.
Measure how far into the container the pot goes. Fill the container with water below this point.
Check often to see if there is still water in the container. If you use a glass vase or a tall caffè latte glass as container you can easily keep an eye on the water level.