Very, very bad things can happen if you misuse this resource. It's intended for theatrical and entertainment use by adults over the age of 18. If you're not an adult, or lack an iota of common sense, best that you turn back now.
Dynamite is universal. Thanks to decades of exposure in films, cartoons, television, and books everyone has an immediate appreciation for what it does. The average person could stumble upon a stash of det-cord or a shaped charge and just shrug their shoulders, but they instantly understand that a stick of dynamite goes "Boom". That makes it perfect for airsoft and LARP games set across a wide variety of time periods.
The standard stick of dynamite is 8" long and 1.25" in diameter. That just happens to be a standard dowel size as well, so a quick trip to the hardware store will give you enough material for an entire bundle of dynamite. If you don't have access to power tools the store will usually be happy to cut your dowel into 8" lengths for a small fee.
Once you have the dowels, print out a label for each stick of dynamite. Heavy brown or red construction paper is ideal, as is the paper used in grocery bags. Trim the labels along the marked cutting lines and then wrap it around the dowel, gluing it into place. A glue stick is perfect for this. There should be an overhang of about 3/4" on either side that you can then fold down and glue in place to cover the ends.
If you want to add a conventional fuse try using jute or cotton cord wiped down with black acrylic paint. Just drill out a hole in one end of the dynamite stick and glue the fuse in place.
The label is reasonably accurate for modern-era dynamite, but you should edit out the "CLASS -A- HIGH EXPLOSIVES LOT 725-06" lines if you're using it in the 1920s-1950s time span. Right click and "Open Link in New Tab" to get the full sized PNG. You can download a PDF of the label over here.