I'm not an expert on the best shower head water filters, but I would encourage you to Google "water filters shower home" or something like that, and see what you find. I think its highly probable that you can find a good one, but it may be a bit expensive.
Your comment about "My begged for time..." hit home. I hear that from clients frequently. I have several who come in primarily because they just can't find the private time they need at home to disappear for an enema, and the colonic session is a restful and relaxing escape, even if they have to hire a babysitter.