I’ve talked about irrigating your garden with clay pots before. You can use an unglazed terracotta pot called an olla, which you bury in the ground and fill with water. The water slowly seeps out the pore in the terracotta and is picked up by the roots of the plant.
But ollas can cost $30 each, which adds up quickly when you are talking about watering an entire garden. However, you can make you own by gluing two terracotta pots together.
It looks like the project is fairly easy–seal the hole in one of the pots, glue them together with Gorilla Glue, then bury like you would a regular olla.
Best of all, if you get your pots cheap enough, you save some money. In this case, the pots cost $1 each.