Depriving yourself of enough water could leave you feeling down. According to a small French study in 2014, researchers found that people who didn't typically drink a lot of water reported better moods when they boosted their water intake. On the flip side, subjects who were used to drinking a lot of water were in a worse mood when they drank less water. Moral of the story: Keep chugging that H₂O to keep a smile on your face.

Unlike cocktails and soft drinks, water is free -- as long as you don't shell out cash on bottled water. Instead, turn everyday tap water into cleaner, drinkable goodness with a Brita® Pitcher System. It reduces the impurities, mercury, zinc and copper, to make water healthier and better-tasting. Plus, one Brita® filter can replace 300 standard bottles of water, which will put roughly $40 back in your pocket per month. We'll drink to that!