Final answer:
Thick-it is a supplement used to thicken liquids to aid in swallowing or digestion for older adults or individuals with swallowing disorders.option a.
Step-by-step explanation:
The supplement that may be purchased by older adult customers to add to their water or juice to assist with swallowing or digestion is thick-it.
This is a dietary product designed to thicken liquids and make them easi
er to swallow for individuals with dysphagia or other swallowing disorders. Thick-it is not a medication but rather a foodservice product that can be easily mixed with various beverages to achieve the desired consistency without altering the taste.