Can red bean, peanut and glutinous rice sugar water be kept in a thermos cup. Thermos cups can keep the temperature of hot drinks and keep the food hot for a certain period of time. Pouring glutinous rice sugar water into a thermos can extend the time it takes to keep the temperature warm. Make sure the thermos is clean and hygienic, and the proper storage time should not be too long to maintain the taste and quality of the food. Red beans are a common ingredient that is also used in various cuisines and desserts. It is small red beans rich in nutrients such as protein, dietary fiber, iron, vitamin B and minerals, which are good for your health.