Sick houseplant? Make it a healthy cocktail. Try pouring a little carbonated water instead of regular tap water when watering unhealthy plants. The reason? The bubbly water has something called macronutrients, which include carbon, oxygen, hydrogen, phosphorous, potassium, sulfur and sodium. These are all nutrients that plants need, and when done through water, they absorb it quickly and can heal themselves -- and also grow at a faster rate. Even if you just have a little leftover club soda, give it to your plants, and say "cheers!"