I managed to get a graduated cylinder. One step in the right direction.
Just to confirm I have understood things correctly:
If I suspect my CA supplement is 18,500 ppm I should add 1 ml of supplement to 49 ml of RODI water and test with my Red Sea Pro Calcium test kit and multiply the result by the total volume of the sample, 50, to determine the supplement concentration. If correct, Test result should be close to 370.
If I suspect my dKH supplement is 2660 dKH I should add 1 ml of supplement to 249 ml of RODI water and test with my Red Sea Pro or Hanna Alkalinity test and multiply the results by the volume of the sample, 250, to determine the supplement concentration. If correct, Test result should be close to 10.64.
Thanks again for your help. In rereading Randy's 2 part article,
http://reefkeeping.com/issues/2006-02/rhf/index.php#19, I realized I probably didn't recognize the fact that Recipe 1 and Recipe 2 were producing different supplement concentrations. When I ran out of BRS 2 part mix and went the DIY approach I just mixed things up according to what I assumed to be the new and improved Recipe 2 ,not realizing there was a difference. This is likely the reason my dosing went out of whack and it took so long to restore. This exercise has proven very educational.