Emptynoti - alert you when your food is running low (#IceboxChallenge)

In the age of touch screen technology we all wish we had a smart refrigerator, alerting us when something is running low or the expiration date is way overdue.
But until everyone will have 20 inch display on their door I want to use a simple method to alert me when something is running low.
For this purpose I introduce "Emptynoti"
One needs only to switch between the correct food status ranging from "full" to "half full" and "empty".
Next time when you go out shopping , open the refrig