Self-watering planter. Cut top third off bottle. Drill small hole in cap. Pass string thru hole. Fill bottom of bottle about halfway with water. Place top upside-down in bottom and put plant in. String will wick up water.
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