Ration Coupons are the lowest tier coupons available in Last Day on Earth Survival. They are easily acquired in Bunker Alfa. You can exchange 20 Ration Coupons at a Rationing Terminal for a ‘Ration Box’. Below, you can see the process of exchanging coupons for rewards.

When interacting with the Ration Terminal, you can see that you will require 20 Ration Coupons to get a Ration Box. You can also see that the potential rewards from opening a Ration Box include Food, Weapons, Parts, Medicine, Resources and Simple protective clothing.

When pressing OK, the Ration Box will head down the conveyor belt ready to be opened.

Open the Ration Box and you can find some of the loot that you received. Some key things that I got from this ration box is a good amount of food including beans and jerky. A Glock along with weapon parts, bandages and medical kits, black spray and some cloth.