Diy Watering System Garden . The downside to drip irrigation is that it can be relatively expensive to set up. It can save you time, money, minimize erosion, reduce the amount of water needed to soak plants, and oh so much more. Build Your Own Easy DIY Indoor Watering System from www.urbanorganicyield.com Dig a hole and put the milk jug in. Dig trenches about a foot deep to bury the pvc pipes in the layout you created. The soda bottle irrigator is then planted in the garden or in a pot with its neck and lid.