Thanks for your researches which have given me a lot of further links as well.

This answer has not been rated.

This answer has not been rated.

I will try the address you suggested, I have looked on the dylan sites
and there is nothing there.  I'll let you know if it is successful. 
Thank you for such a prompt reply.  Wish me luck!

I had found details of these courses before, but I was hoping that I
might be missing something!  I am very impressed by your standard of
work.  Well done, and thank you!

I feel like leli gave me even more help than I thought of asking for! 
I am very, very, very happy with my answer!!!

This answer has not been rated.

THANK YOU

This answer has not been rated.

This answer has not been rated.

Great answer!  I had not yet encountered Glasser's work.  I wish there
was another, non-RO answer for us, but we have vulnerable young
children and we have to do something.  One has already had significant
damage to his teeth due in part to prescribed fluoride drops (when we
had well water).  Maybe we'll try catching (and filtering) rain water
instead!

This answer has not been rated.

This answer has not been rated.

This answer has not been rated.