A pinch between the cheek and gums!

There are solid fuels out there that are packable. I have not been able to get a single Esbit cube to bring an 8 ounce cup of water to a boil though. These cubes are smaller than the old "Heat Tabs" and do work well. The test was near sea level in mid 40s (F) temperatures. It took 2 cubes to reach a boil. Boiling is not required for a cup of coffee, especially instant. In the woods, I usually use the Esbit to help start a good wood fire rather than for cooking by itself. It depends on the rules where you are.