[header] How to make a leyden jar [title] Choose a jar. [step] You have to be careful about what materials you use to construct your leyden jar. The material must serve as an insulator between the inner charge (+) and the outer charge (-). 
Choose a glass jar or a plastic bottle with a lid. [substeps] If possible, get a big jar or bottle, such as one that holds 0.5 to 1 gallon (1.9 to 3.8 l).