Bucci, that's why I believe Dr. Jernigan's protocol is so fantastic because he address the mind, spirit and body which only makes sense to me as when one part of the body is out of whack it affects the rest of the body.
CG, I bought my enema bag from this site (I bought the premium 2 quart bag for $39.95):
If you click on the left side there are instructions (I never tried wheatgrass or the other types they mention) and I should say if I feel full down there, I first do a clear water enema and then I do the coffee (I buy organic coffee from any market already grounded).
I hang the bag on my towel rack (never measured how many feet it is from my butt!). Just click around the site as it has really good information.
I was really nervous about doing it the first time but felt really good afterward so it's worth it, believe me!