The video shows a man making a homemade kvass drink. Here is the process: 1. **Add dry ingredients to a jar:** He puts a handful of grains, a small scoop of sugar, and a handful of raisins into a large glass jar. 2. **Add water and sweetener:** He fills the jar with purified water, leaving some space at the top. He adds two spoons of honey and stirs everything well. 3. **Fermentation:** He covers the jar with a piece of gauze and lets it ferment at room temperature for six days. 4. **Serving:** After six days, he strains the liquid through the gauze into a mug and enjoys the finished natural kvass.