i would say try some juice fasting. that does two things. it provides easily assimable nutrients (and especially minerals) to the body, and it also does a wonderful job of reducing inflammation. i had Arthritis once upon a time and juice fasting and bowel cleansing has me nearly symptom free.
there is a product called FYI made by garden of life. i have never used it but it looks very good to me. i use other products by that company and think they make quality stuff.
homemade crushed bone chicken broth is great for arthritis. boil the bones till soft, then crush them with a pliers so the marrow can get into the broth, then simmer them for a good couple hours. very nourishing. you can freeze it in small amounts so you can take some everyday.
you may also want to look into the moreless "alkalizing drink" on the ask moreless ph forum.