Jasmine,
I bought a cheap enema bag from a drugstore to get started with. It is working fine. You can pay a lot for a bag (I mean over a hundred dollars) or just get a bag from the drugstore and pay less than twenty bucks. I have a two quart one. Click on the URL below to see the instructions. Coffee one is the one I like to do. I have done it with plain water too.
Good luck. It is not as bad as it sounds. I do not mind it at all.