A friend of mine was describing how he used to obtain Chlorine gas for use in manufacturing potassium chloride which he used to to all sorts of fun things, like making c4 and rocket engines.
All you have to do is go to your local convenience store and purchase chlorine bleach and drano. Now, find an empty glass or plastic vessel that can be stoppered with a hose, pour the bleach in until the vessel is about ¼ full, then add an equal amount of drano and quickly stopper the vessel.
The chemical reaction is quite simple, and without going into specifics the drano-fu knocks a chlorine ion off of the bleach molocule and the free chlorine ions combine to form Cl2: chlorine gas.
You can take your hose and use the jet of chlorine gas with whatever you like. You could lead the hose into another stoppered vessel, although you may find the gas is difficult to store.
Be careful! This stuff can be dangerous!