If you're a chronic neglecter of your watering duties, you may have looked into finding ways to have your plants watered automatically. Enter the glass bottle, or more specifically, the cool-looking glass Coke bottle that we all love (unless you're a Pepsi fan, in which case you can go that route, too).
By giving it a nice plastic stem to plant in the dirt, you can use it to water your plants for you — using gravity flow. Sure, you can pay more for specially made glass baubles at the gardening store, but they're not Coke bottles.
Turn a Glass Coke Bottle in to a Plant Waterer [Instructables]