1. Go to your profile on Hidrate app (second button from the left in the navigation bar)
2. Click on Settings (upper right corner)
3. Click on Connect to Apps
4. Slide the toggle for Fitbit to the right. It will prompt you to login to your Fitbit account to establish the connection.
Once you're done, you can check it by:
1. On the Fitbit app, try adding around 4 oz. Then back to the Hidrate app - the amount should update instantaneously.
2. On the Hidrate app, try drinking some water or adding 4 oz. The Fitbit will update this amount in 30 seconds or less.