[header] How to build a calorimeter [title] Get a small metal can. [step] This can will be used to contain water that will be heated as part of the calorimetric measurements. Any small metal can will work, such as those used to package vegetables, or a soda can. 
Make sure that it is empty, clean, and open on one end. If you are using a soda can, the opening used for drinking out of the can will suffice.