Need Ideas for Dosing Kalk!

I really would like to start dosing kalk in my reef tank. My tank is a Fluval Spec V which is around 5.5 gallons, so it is a nano tank. The problem is I can't find a way to safely and effectively dose kalk. A Kalk dripper won't work unless I can find a way for it to give off one drop every 5-10 minutes and at the end of the day dispense around 1-1.5 cups or less of the solution so it's not faster or more than my evaporation rate. ATO is a no, my ATO runs once or twice day to replace the 1-1.5 cups of water lost and that would be way too much kalk added to my tank at once. I'm clueless and lost on how to dose kalk, and my tank would really benefit from the stuff. Help please!!