S'well Water Bottle ($26)
The final item I recommend getting is a water bottle. Not only does being hydrated help with your lethargy, it also can help reduce your feelings of hunger. Whenever I feel like snacking, I drink 8-12 ounces of water and then wait 20 minutes. Most times, my hunger dissipates instantly! Carrying around a water bottle ensures that you'll reach for water instead of a snack. Generally, doctors recommend between 12 and 15 cups per day - so having a big water bottle will help you hit your consumption targets.