To get real feedback, I used 3D printing to create a prototype of my bowl and took it to a Lambeth and Southwark Diabetes UK Group meeting to test it. I talked to them individually (a total of 12 people), and it seemed that they could understand my design idea well. Most of them expressed that they thought this design was straightforward and may work for them.
However, some said they usually eat food with a small plate or partition plate to control the food potion. Some care about the function and price, like if it is microwave-safe and affordable. The size of my bowl maybe a bit small also be mentioned. Their feedback encouraged me to go through my potion tableware idea and narrow it down.