The Eatwell Guide recommends that people should aim to drink 6 to 8 cups or glasses of fluid a day. Water, lower-fat milk and sugar-free drinks, including tea.
Peace lilies are almost always thirsty. The solution is simple. Put a deep tray underneath and add water every few days to the tray and let it drink up from.
Water only after the soil has dried. If you have trouble watering your Begonia, a good rule of thumb is to water it after half of the soil ball is dry. Give.