In addition to recycling plastic bottles and jugs for watering slowly, try to recycle your waste water for the garden. Water collected in rain barrels, or water from the bath or laundry can be used in the garden. I'd probably use glass bottles.
Self watering hanging basket. The link shows putting a small pot in center and filling with water but I like the water bottle idea shown in illustration.remember to line bottom with plastic bag (between the soil and fiber or moss) - Gardening For Life