Drink some water when you first get up in the morning. Some people only drink milk or coffee in the morning, but adding at least one glass of water will help to increase your hydration in the morning. You can keep a water bottle beside your bed if that makes it easier to remember to drink it.
Carry water on you at all times. Water bottles are cheap to buy and can be carried to work, to school, or whenever you are away from the house for several hours. Some have marks for reading how many milliliters or fluid ounces of liquid you have, so that you can keep track of how much you have been drinking.