What material is Zhongtian gas cylinder made of in the news?

DIY material of gas cylinder: potassium nitrate 2.5g, ammonium chloride 2.5g, distilled water 33mL, ethanol 40mL, natural camphor 10g. These materials are very easily available in general chemistry laboratories. Have studied chemistry and made (and succeeded in) gas cylinders by yourself? (TB sells DIY material packages, but it is also quite expensive. I don't know if I can succeed. What should I pay attention to in the production process? Is it feasible to crush ordinary mothballs instead of natural camphor?