Thanks all. At least its good to hear others talk about my problem. By the way, I've been juicing organic vegetables for the last 10 years. This includes the dark green leafy ones like spinach and kale. I also thought this was the best way to get calcium, but, I have my doubts now. Of course, its impossible to juice on the road, but, thats a once in 5 year situation. Hopefully, I'll be able to do the TA in 2010.
Lack of calcium is not necessarily the cause of your osteoporosis. If it were that simple, not enough calcium, its cure would be simple, but it is not that simple. There are doctors who specialize in treating osteoporosis, and there is more to it than taking calcium, and in some cases there may be no cure. Calcium chelated with vitamin D is one good thing to take. I believe cod liver oil can give you vitamin D.
It is not impossible to juice on the road. There are hand operated juicers. They are not as efficient as the high grade electric juicers, but they do work.
I own a better quality electric juicer myself. I saw a light weight hand-crank juicer somewhere for sale on the internet. I saw one such machine used for juicing wheat grass. It was in Berkley, California. It looked to me to be pretty efficient; slow with a small hopper, but it worked. Actually, I was thinking about taking one with me on my next tour. Freshly juiced carrots, celery, and cucumbers give you all vitamins and minerals, though vitamin D is not all that plentiful. I have found that drinking a fifty-fifty mix of a quart of freshly extracted celery and carrot juice is like a magic elixir for resiliance against heat and the beat-down effect of direct sunlight.