DIY? Bucket drip kits, a one time cost of $12, allow growing vegetables during the dry season using drip irrigation. Drip irrigation, originally developed in Israel, targets precious water to where it needs to go, the roots of the plants. Much less labor - it uses water efficiently. Less to lug, less time spent fetching it, more time gardening.
Easy garden watering The whole system only took about 30 minutes to install. I had never dealt with any plumbing at all before and it was extremely easy. The snap nozzle at the end of the hose is great and quick if I need to use the other end of the hose for something else. It's great! You can get the Snip-n-Drip Soaker System from amazon.
Irrigation spikes - attach these spikes to old soft drink bottles to create an efficient irrigation system for your garden! The slow-drip design delivers water deep into the soil, so your plants stay nourished while you save time watering.
The water cycle. Drip the water drop and his adventure through water. This would good for older students. 2nd or 3rd grade. This could also be tied into a social studies lesson in order to help understand what is going on as Drip travels along the water.