There's evidence that 60 grams of prunes a day helps to maintain bone density, and 100 grams increases it. A study showed that Jarlsberg cheese which contains a variety of K vitamins, helps to maintain bone density.

My Dexa results improved from osteoporosis to osteopenia without medication. However, I'm concerned that my lumbar spine needs to improve, so I'm drinking alkaline water.

Studies about the two foods and water would be listed on Google Scholar.