But they can be pretty pricey. We bought 2 medium sized self-watering containers for $10 each, and that was as cheap as we had seen them. We were going to need more than that but were about out of money. So we decided to make our own, cheaply.
WHAT YOU'LL NEED
A regular plant pot or tub
a smaller tub for insert/reservoir - make sure it fits the bottom of your tub without leaks in the sides
A piece of piping, or you could use an empty plastic bottle
Fill in any drainage holes in the pot. You can use putty or line with a bag etc.
Poke holes in the insert/smaller tub.
Cut up strip of fabric and thread them through the holes in the insert. These will act as the wic, to suck up water from the reservoir.
Cut up piping, or plastic bottle. We will be using this to fill the reservoir with water, every few days.
Cut a hole in the insert, to place the piping.
Place insert in pot, make sure there are no gaps.
Have your kids help you if you want. They come in handy for that.
Try to stop your 7 month old from ingesting too many microbes
Fill with dirt, plant your plants. Water from above once, then fill the reservoir. From now on, only water from the pipe.