The invention provides a food and water thickener and a method for preparing the food and water thickener. The food thickener comprises pretreated mineral water, xanthan, food preservative, a first antimicrobial and chelating agent, and a sequestering agent, wherein the food thickener has a density of between 750 and 1250 grams per liter. The method for producing the thickener incorporates pretreatment of mineral water and xanthan, and specific heating steps. Also provided is method for producing thickened alcoholic beverages. The invention further provides a method for invoking a swallow response in dysphagic patients, the method comprising increasing the mass of food to between 750 mg per liter and 1500 mg per liter; and orally administering the food to dysphagic patients.