Yes, you can choose whether or not with a toggle to have certain drink types count towards your daily hydration goal (either in Settings - Drink List - Drink Types, or on the Add Liquid screen, or on the Adjust Liquid screen). If you have “Count Towards Goal” enabled it will take into account the hydration impact of that drink type when adding to your goal. If you turn off “Count Towards Goal” for a drink type, you can still record it and it will show up in the breakdown within history, but will not count towards your hydration goal for the day.
In your hydration history on the Home Screen, you will see 2 separate amounts: Hydration (only drinks that are counted towards the goal) and All Drinks (all liquids consumed).
When a drink is not counting towards the Hydration Goal the sip cell in the Drink Log will appear transparent.