Herbal teas and cutting out gluten have helped tremendously for me. A multivitamin and probiotics are good additions to the diet as well. Topically, use the most natural (even homemade) products possible. Raw honey makes a great antibacterial mask.

I wash my face and body with only water, drink lemon water a lot, and consume those herbs

Water only method has noticeably improved my acne but I've always had very minimal acne. Oily skin is my big problem and washing my face with water has slighlty inproved the oil too but not greatly. I've been drinking a lot of lemon water in hopes to balance my internal ph levels and that has slighly helped my complexion as well. As far as supplements I am currently experimenting with saw palmetto and rosemary capsules so I'll see how that goes.