Drink water! WATER WATER!  Sometimes it can be yuk! Find a water fountain and take 10 SLurps between every class!  Drink a small cup of water before every meal or while you wait for it to cook. Have whatever you normally drink after wards. If you have a snack, sip water with it. Lastly, end the day with water. Have a small cup before you go to bed, like a tea cup.