The best way that I’ve found to get into habit of drinking enough water is to put 6 half-liter bottles in your fridge for next day. Grab first one when you wake up and set alarm on your fitbit for every 2-3 hours to start next bottle. Many healthy eating plans suggest small portions food every 3 hours so it works out well. Once you get into good habits, you can switch to a reusable bottle. Flavor enhancers or infusion can help in the beginning if you don’t like plain water.