you can buy probiotics and activated charcoal (both available in capisules) from www.vitacost.com it's a good website, and you can even google some 5% off coupon or something.

yogurt is very good, but the ones available on market have too much sugar. maybe learn how to make it yourself?

all these were mentioned by others already.

coffee enema, very hard to DIY, and I don't think it's needed for healthy people.