We added four commercially available thickeners to white rice porridge with salty plum, which is popular in Japan, and compared the viscosity. Porridge containing water is useful even in the event of a disaster. In Japan, porridge is useful as a stockpile of food during disasters. Porridge is used as a meal of a wide range of age groups, form the elderly to infants. However, if porridge is made into a liquid using a mixer, etc., it becomes a food with a high risk of aspiration for people with impaired swallowing function. Therefore, it is necessary to add a thickener to the liquid porridge to increase its viscosity. In order to keep the consistency, the thickening agent should be changed according to the amount of nutrients contained in the porridge.